APA (7th ed.) Zitazioa
SONNIER-YORK, C., & STANFORD, P. (2002). LEARNING TO COOPERATE. A TEACHER'S PERSPECTIVE.
Chicago Style (17th ed.) Zitazioa
SONNIER-YORK, C., eta P. STANFORD. LEARNING TO COOPERATE. A TEACHER'S PERSPECTIVE. 2002.
MLA (9th ed.) Zitazioa
SONNIER-YORK, C., eta P. STANFORD. LEARNING TO COOPERATE. A TEACHER'S PERSPECTIVE. 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.