Iowa State Vegetable Growers' Association, Iowa Potato and Truck Growers' Association, & Iowa State Horticultural Society. Annual report of the Iowa State Vegetable Growers' Association. Iowa State Horticultural Society [etc.].
Chicago-referens (17:e uppl.)Iowa State Vegetable Growers' Association, Iowa Potato and Truck Growers' Association, och Iowa State Horticultural Society. Annual Report of the Iowa State Vegetable Growers' Association. [Iowa]: Iowa State Horticultural Society [etc.].
MLA-referens (8:e uppl.)Iowa State Vegetable Growers' Association, et al. Annual Report of the Iowa State Vegetable Growers' Association. Iowa State Horticultural Society [etc.].
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.