APA (7th ed.) Zitazioa
Birkey, V. (1978). You: A people helper. Enriched Living.
Chicago Style (17th ed.) Zitazioa
Birkey, Verna. You: A People Helper. Kent, Washington: Enriched Living, 1978.
MLA (9th ed.) Zitazioa
Birkey, Verna. You: A People Helper. Enriched Living, 1978.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.