When an editor’s name is not in the author position, write the initial(s) first, then the last name (note the placement of “M. Lewis,” and “Berch, & M. M. Mazzocco” in the examples below).
The first editor is preceded by In.
When referring to a specific section of an edited book, use the abbreviation for page (p. or pp.).
Yarrow, L. J., & Messer, D. J. (1983). Motivation and cognition in infancy. In M. Lewis (Ed.), Origins of intelligence: Infancy and early childhood (2nd ed., pp. 451-478). Plenum Press.
Donlan, C. (2007). Mathematical development in children with specific language impairments. In D. B. Berch, & M. M. Mazzocco (Eds.), Why is math so hard for some children?: The nature and origins of mathematical learning difficulties and disabilities (pp. 151-172). Paul H. Brookes Publishing Company.
(American Psychological Association, 2020, p. 326)