APA aipamena

McMullan, P. F. (1986). Northern Ireland twin study 1983.

Chicago Style aipamena

McMullan, P F. Northern Ireland Twin Study 1983. 1986.

MLA aipamena

McMullan, P F. Northern Ireland Twin Study 1983. 1986.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.