Παραπομπή APA

Ball, R. M. (1978). Social security today and tomarrow. Columbia University Press.

Παραπομπή Chicago Style

Ball, Robert M. Social Security Today and Tomarrow. New York: Columbia University Press, 1978.

Παραπομπή MLA

Ball, Robert M. Social Security Today and Tomarrow. Columbia University Press, 1978.