APA

Serviss G. H., Ahlgren G. H., . (1955). Grassland farming. New York: Wiley.

Chicago

Serviss George H, Ahlgren Gilbert H, . 1955. Grassland farming. New York: Wiley.

Harvard

Serviss G. H., Ahlgren G. H., . (1955). Grassland farming. New York: Wiley.

MLA

Serviss George H, Ahlgren Gilbert H, . Grassland farming. New York: Wiley. 1955.