Bradfield, D. J. (1966). Guide to extension training. Food and Agriculture Organization of the United Nations.
Chicago-referens (17:e uppl.)Bradfield, D. J. Guide to Extension Training. Rome: Food and Agriculture Organization of the United Nations, 1966.
MLA-referens (8:e uppl.)Bradfield, D. J. Guide to Extension Training. Food and Agriculture Organization of the United Nations, 1966.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.