APA aipamena

D.G.Mackean. (2002). IGCSE Biology. Hodder Education.

Chicago Style aipamena

D.G.Mackean. IGCSE Biology. Hodder Education, 2002.

MLA aipamena

D.G.Mackean. IGCSE Biology. Hodder Education, 2002.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.