The first author's name is written with the surname first, as usual, but the second and third authors are recorded with given name or initial first.
Cunnington, C. Willet, and Phillis Cunnington. Handbook of English Costume in the Nineteenth Century. Boston: Plays, Inc., 1970.
The Latin "et al." (et alia in full), meaning "and others" is used.
Jung, C. G., et al. Man and His Symbols. New York: Dell, 1968.