APA

Duckham A. N., Masefield G. B., . (1970). Farming systems of the world. New York [u.a.]: Praeger.

Chicago

Duckham Alec N, Masefield Geoffrey B, . 1970. Farming systems of the world. New York [u.a.]: Praeger.

Harvard

Duckham A. N., Masefield G. B., . (1970). Farming systems of the world. New York [u.a.]: Praeger.

MLA

Duckham Alec N, Masefield Geoffrey B, . Farming systems of the world. New York [u.a.]: Praeger. 1970.