APA

Barrett M. A., . (1979). Milk and beef production in the tropics. Oxford: Oxford university press.

Chicago

Barrett M A, . 1979. Milk and beef production in the tropics. Oxford: Oxford university press.

Harvard

Barrett M. A., . (1979). Milk and beef production in the tropics. Oxford: Oxford university press.

MLA

Barrett M A, . Milk and beef production in the tropics. Oxford: Oxford university press. 1979.