APA 7th - multiple works by the same author

Reference list

Different works by the same author are listed in chronological (date) order.

Example

Clarkson, P. M. (2006). Case report of exertional rhabdomyolysis in a 12-year-old boy. Medicine & Science in Sports & Exercise, 38(2), 197-200.

Clarkson, P. M. (2007). Exertional rhabdomyolysis and acute renal failure in marathon runners. Sports Medicine, 37(4-5), 361-363.

Clarkson, P. M. (2011). Another great year in the making. Exercise & Sport Sciences Reviews, 39(1), 1.

References with the same first author and a different second or third author are listed alphabetically by author.

Example

Bloomfield, F. H., Oliver, M. H., Giannoulias, C. D., Gluckman, P. D., Harding, J. E., & Challis, J. R. (2003, Jul). Brief undernutrition in late-gestation sheep programs the hypothalamic-pituitary-adrenal axis in adult offspring. Endocrinology, 144(7), 2933-2940. https://doi.org/10.1210/en.2003-0189

Bloomfield, F. H., Oliver, M. H., Hawkins, P., Campbell, M., Phillips, D. J., Gluckman, P. D., Challis, J. R., & Harding, J. E. (2003, Apr 25). A periconceptional nutritional origin for noninfectious preterm birth. Science, 300(5619), 606. https://doi.org/10.1126/science.1080803

Clarkson, P. M., & Eichner, E. R. (2006). Exertional rhabdomyolysis: Does elevated blood creatine kinase foretell renal failure? Current Sports Medicine Reports, 5(2), 57-60.
 
Clarkson, P. M., Hoffman, E. P., Zambraski, E., Gordish-Dressman, H., Kearns, A., Hubal, M., Harmon, B., & Devaney, J. M. (2005). ACTN3 and MLCK genotype associations with exertional muscle damage. Journal of Applied Physiology, 99(2), 564-569.
 
Clarkson, P. M., & Kaufman, S. A. (2010). Should resistance exercise be recommended during breast cancer treatment? Medical Hypotheses, 75(2), 192-195.
 
Clarkson, P. M., Kearns, A. K., Rouzier, P., Rubin, R., & Thompson, P. D. (2006). Serum creatine kinase levels and renal function measures in exertional muscle damage. Medicine & Science in Sports & Exercise, 38(4), 623-627.
 
Clarkson, P. M., & Kroll, W. (1978). Practice effects on fractionated response time related to age and activity level. Journal of Motor Behavior, 10(4), 275-286.
 
Clarkson, P. M., Kroll, W., & Melchionda, A. M. (1981). Age, isometric strength, rate of tension development and fiber type composition. Journal of Gerontology, 36(6), 648-653.
 
Clarkson, P. M., Kroll, W., Wai, J., & Kamen, G. (1981). A comparison of four methods to measure fat cell size. American Journal of Clinical Nutrition, 34(10), 2287-2290. 

If several works have the same date, as well as the same author, works are distinguished by suffixes a, b, c, etc. These are allocated in the reference list where they are ordered alphabetically by title. 

Example

Ministry of Health. (2003). Child health information strategy. 

Ministry of Health. (2007a). New Zealand smoking cessation guidelines. 

Ministry of Health. (2007b). Whānau ora health impact assessment. 

Ministry of Health. (2008a). The B4 school check: A handbook for practitioners. 

Ministry of Health. (2008b). Pacific cultural competencies: A literature review. https://www.health.govt.nz/publication/pacific-cultural-competencies-literature-review 

Ministry of Health. (2008c). A portrait of health: Key results of the 2006/07 New Zealand health survey. 

Note: When the Author is also the Publisher, omit the Publisher details. 

In-text citation

When citing two or more works by the same author, the different publication dates will lead the reader to the correct entry in the reference list.

  • ... was found to be the case (Clarkson, 2006, 2007, 2011; Clarkson & Eichner, 2006; Clarkson et al., 2005; Clarkson & Kaufman, 2010; Clarkson et al., 2006).

  • ... a health information strategy is needed for all New Zealanders (Ministry of Health, 2003, 2007a, 2007b, 2008a, 2008b, 2008c).

OR
  • Clarkson (2006, 2007, 2011) found that attendance ...

  • Ministry of Health (2003, 2007a, 2007b, 2008a, 2008b, 2008c) stated that the health of New Zealanders ...

When two or more publications have the same first author's surname and are from the same year then you will need to expand them until there is enough difference to be able to identify them in your reference list.

  • ... the effect of undernourished pregnant ewes (Bloomfield, Oliver, Giannoulias, et al., 2003).
  • ... preterm birth can be effected by nutrition at the time of conception (Bloomfield, Oliver, Hawkins, et al., 2003).

OR

  • Bloomfield, Oliver, Giannoulias, et al. (2003) discussed undernutrition in late-gestation sheep.
  • Bloomfield, Oliver, Hawkins, et al. (2003) found that nutrition at the time of conception can impact ...

NOTE: If the use of et al. leaves only one surname, then you need to write all the authors out, as et al. means "and others".

  • Clarkson, Kroll and Melchionda (1981) looked at isometric strength ...
  • Clarkson, Kroll, Wai and Kamen (1981) compared the measuring of fat cells ...
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