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.].
Παραπομπή σε μορφή Chicago (17η εκδ.)Iowa State Vegetable Growers' Association, Iowa Potato and Truck Growers' Association, και Iowa State Horticultural Society. Annual Report of the Iowa State Vegetable Growers' Association. [Iowa]: Iowa State Horticultural Society [etc.].
Παραπομπή σε μορφή MLA (8th εκδ.)Iowa State Vegetable Growers' Association, et al. Annual Report of the Iowa State Vegetable Growers' Association. Iowa State Horticultural Society [etc.].
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.