Envirnment. Vol.21, 1979. Cornelious W.Vahle.
Chicago Style aipamenaEnvirnment. Vol.21, 1979. Washington: Cornelious W.Vahle.
MLA aipamenaEnvirnment. Vol.21, 1979. Cornelious W.Vahle.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena