If there are two authors of a work, both should be cited.
Example:
McMillan and Weyers (2011) state that...
OR
...(McMillan & Weyers, 2011).
Note: Link the two authors’ names with and when cited outside parentheses. Link with an ampersand (&) inside parentheses.
Last name, Initial(s)., & Last name, initial(s). (Year). Title (ed.). Publisher. DOI (if available)
Example:
McMillan, K., & Weyers, J. D. B. (2011). How to write essays & assignments (2nd ed.). Pearson.