APA

Upton M., . (1979). Farming as a business. London: the english language book society.

Chicago

Upton M, . 1979. Farming as a business. London: the english language book society.

Harvard

Upton M., . (1979). Farming as a business. London: the english language book society.

MLA

Upton M, . Farming as a business. London: the english language book society. 1979.