Gaya APA

1922, N., I., L. (1989). Vegetable production / IB Libner Nonnecke . New York: Van Nostrand Reinhold.

Gaya MLA

Nonnecke, Ib, Libner,, 1922. "Vegetable production / IB Libner Nonnecke". New York: Van Nostrand Reinhold, 1989. Textbook.