Gyorg, Paul, & Paul Gyorgy. (1951). Vitamin methods v.2. Academic press.
Chicago Style aipamenaGyorg, Paul, and Paul Gyorgy. Vitamin Methods V.2. Academic press, 1951.
MLA aipamenaGyorg, et al. Vitamin Methods V.2. Academic press, 1951.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.