For ten or fewer authors, list them all. List the names in the order they appear in the text.
General Format
In-Text Citation for Two Authors:
(Author and Author date)
In-Text Citation for Three or More Authors:
(Author et al. date)
Author AA, Author BB. Year. Title of book. Edition. Place of publication (State or Prov): Publisher name.
Example
In-Text Citation for Two Authors:
(Lewontin and Levins 2007)
In-Text Citation for Three or More Authors:
(Wyneken et al. 2008)
Reference List:
Lewontin RC, Levins R. 2007. Biology under the influence: dialectical essays on ecology, agriculture, and health. New York (NY): Monthly Review Press.
Wyneken J, Bels VL, Godfrey, MH, editors. 2008. Biology of turtles. Boca Raton (FL): CRC Press.