Example (for 2 authors):
Walsh, J. T., & Perks, R. E. (1990). Name of Textbook. New York: ABC Publishing Co.
Example (for 3 or more authors):
Mills, F. S., Boons, M. K., Fish, S. S., Garlan, A. U., Bilde, G. J., Thomson, J. T., . . . Robin, B. H. (2000). Web site usability for blind students. Technical Communication, p.333.