APA aipamena

Ross, R. G. (1970). Obligation: A social theory. University of Michigan Press.

Chicago Style aipamena

Ross, Ralph Gilbert. Obligation: A Social Theory. Ann Arbor: University of Michigan Press, 1970.

MLA aipamena

Ross, Ralph Gilbert. Obligation: A Social Theory. University of Michigan Press, 1970.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.