APA (7th ed.) Zitazioa
Halford, N. G. (2003). Genetically modified crops. Imperial College Press.
Chicago Style (17th ed.) Zitazioa
Halford, N. G. Genetically Modified Crops. London: Imperial College Press, 2003.
MLA (9th ed.) Zitazioa
Halford, N. G. Genetically Modified Crops. Imperial College Press, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.