APA aipamena

(1970). Contours of change. Washington, D.C: Argriculture.

Chicago Style aipamena

Contours of Change. Washington, D.C: Argriculture, 1970.

MLA aipamena

Contours of Change. Washington, D.C: Argriculture, 1970.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.