APA aipamena

Koch, H. L. (1966). Twins and twin relations. University of Chicago Press.

Chicago Style aipamena

Koch, Helen Lois. Twins and Twin Relations. Chicago: University of Chicago Press, 1966.

MLA aipamena

Koch, Helen Lois. Twins and Twin Relations. University of Chicago Press, 1966.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.