Citazione APA

Kelley, W. C., & Thompson, H. C. (1957). Vegetable crops (5.). Mc Graw Hill Book company.

Stile di citazione Chicago

Kelley, W C., e H C. Thompson. Vegetable Crops. 5. NewYork: Mc Graw Hill Book company, 1957.

Citazione MLA

Kelley, W C., e H C. Thompson. Vegetable Crops. 5. Mc Graw Hill Book company, 1957.