Chaires, Robert H., and Bradley S. Chilton. Star Trek Visions of Law and Justice. Adios Press, 2003.
Use only the first author's name, followed by et al. (Latin for "and others" ; there is no period after et, there is a period after al.)
Dubeck, Leroy W., et al. Science in Cinema: Teaching Science Fact through Science Fiction Films. Teachers College Press, 1988.
Rothman, Hal. “Water and the Future of Las Vegas.” Water in the West: A High Country News Reader, edited by Char Miller, Oregon State UP, 2002, pp. 242-44.