McGehee, P. (1985). Beyond happiness. Stubbeljumper Press.
Chicago-Zitierstil (17. Ausg.)McGehee, Peter. Beyond Happiness. Toronto: Stubbeljumper Press, 1985.
MLA-Zitierstil (8. Ausg.)McGehee, Peter. Beyond Happiness. Stubbeljumper Press, 1985.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.