List the author by last name first, then initial(s).
Luby, J. L. (2006). Handbook of preschool mental health: Development, disorders, and treatment. Guilford Press.
Write both authors’ last names, followed by initials. Place an ampersand (&) before the second author.
Hetzroni, O. E., & Shalahevich, K. (2018). Structure Mapping in Autism Spectrum Disorder: Levels of Information Processing and Relations to Executive Functions. Journal of Autism & Developmental Disorders, 48(3), 824–833. https://doi.org/10.1007/s10803-017-3376-x
Three to Twenty Authors
When there are three to 20 authors write all the authors’ last names and first initials, and use an ampersand (&) before the last name.
Lightfoot, C., Cole, M., & Cole, S. (2013). The development of children (7th ed.). Worth Publishers.
Twenty-One and More Authors
Include the first 19 authors, followed by three ellipsis points (…), and add the last author.
Åkerlund, C., Amrein, K., Andelic, N., Andreassen, L., Anke, A., Antoni, A., Audibert, G., Azouvi, P., Azzolini, M. L., Bartels, R., Barzó, P., Beauvais, R., Beer, R., Bellander, B.-M., Belli, A., Benali, H., Berardino, M., Beretta, L., Blaabjerg, M., … Steyerberg, E. W. (in press). Machine learning algorithms performed no better than regression models for prognostication in traumatic brain injury. Journal of Clinical Epidemiology. https://doi.org/10.1016/j.jclinepi.2020.03.005
An article that is not quite ready for publication is labeled in press, and is considered an online preview.
(American Psychological Association, 2020, p. 317)