A W Van den Ban. (1988). Agricultural extension. New York: John Wiley & Sons, Inc.
Chicago Style aipamenaA W Van den Ban. Agricultural Extension. New York: John Wiley & Sons, Inc, 1988.
MLA aipamenaA W Van den Ban. Agricultural Extension. New York: John Wiley & Sons, Inc, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.