Purdue University Online Writing Lab (OWL)

A student is creating a reference list for a research paper. Below is one of their entries for a journal article. According to the standard formatting guidelines used in psychological research, what is the primary error in this entry?

Smith, J. D. (2020). The Effects of Sleep Deprivation on Cognitive Performance. Journal of Experimental Psychology, 146(3), 45-67.

What is the primary function of the Publication Manual of the American Psychological Association?

The Publication Manual of the American Psychological Association is a static document that has remained unchanged since it was first published as a brief journal article in 1929.