MLA uses "et al." for works with three or more authors.
For works with 3 or more authors, use "et al." from the first citation onward in APA 7th. campbell biology 11th edition citation
Below are the precise citation formats for the 11th edition across major academic styles, including APA, MLA, Chicago, and Harvard formats. Core Book Information Reference MLA uses "et al
In-text citation: (Campbell and Urry 23) 11th edn
Urry, L.A., Cain, M.L., Wasserman, S.A., Minorsky, P.V. and Reece, J.B. (2017) Campbell biology . 11th edn. New York: Pearson.
Urry, Lisa A., Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, and Jane B. Reece. Campbell Biology . 11th ed. New York: Pearson, 2017.
Urry, L. A., Cain, M. L., Wasserman, S. A., Minorsky, P. V., & Reece, J. B. (2017). Campbell biology (11th ed.). Pearson Education, Inc. In-Text Citations (Urry et al., 2017)