Franklin

MLA

Butler, Robert N., and Myrna I Lewis. Sex After Sixty : a Guide for Men and Women for Their Later Years. New York: Harper & Row, 1976.

APA

Butler, R. N., & Lewis, M. I. (1976). Sex after sixty : a guide for men and women for their later years. New York: Harper & Row.

Chicago

Butler, Robert N., and Myrna I Lewis. Sex After Sixty: A Guide for Men and Women for Their Later Years. New York: Harper & Row, 1976.