National Irrigation Symposium Phoenix, Ariz, & International Irrigation Exposition. (1990). Visions of the future: Proceedings of the Third National Irrigation Symposium held in conjunction with the 11th Annual International Irrigation Exposition, October 28-November 1, 1990, Phoenix Civic Plaza, Phoenix, Arizona. American Society of Agricultural Engineers.
Chicago-referens (17:e uppl.)National Irrigation Symposium Phoenix, Ariz, och International Irrigation Exposition. Visions of the Future: Proceedings of the Third National Irrigation Symposium Held in Conjunction with the 11th Annual International Irrigation Exposition, October 28-November 1, 1990, Phoenix Civic Plaza, Phoenix, Arizona. St. Joseph, Mich.: American Society of Agricultural Engineers, 1990.
MLA-referens (8:e uppl.)National Irrigation Symposium Phoenix, Ariz, och International Irrigation Exposition. Visions of the Future: Proceedings of the Third National Irrigation Symposium Held in Conjunction with the 11th Annual International Irrigation Exposition, October 28-November 1, 1990, Phoenix Civic Plaza, Phoenix, Arizona. American Society of Agricultural Engineers, 1990.