Artl@s Bulletin | Purdue University Press. Cambridge University Press.
Chicago Style (17th ed.) ZitazioaArtl@s Bulletin | Purdue University Press. Cambridge University Press.
MLA (9th ed.) ZitazioaArtl@s Bulletin | Purdue University Press. Cambridge University Press.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.