APA aipamena

(2004). English Grammar: Verbs. New York: Video Aided Instruction.

Chicago Style aipamena

English Grammar: Verbs. New York: Video Aided Instruction, 2004.

MLA aipamena

English Grammar: Verbs. New York: Video Aided Instruction, 2004.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.