APA

Westermann D., . (1934). The African to-day. London: Oxford University Press.

Chicago

Westermann Diedrich, . 1934. The African to-day. London: Oxford University Press.

Harvard

Westermann D., . (1934). The African to-day. London: Oxford University Press.

MLA

Westermann Diedrich, . The African to-day. London: Oxford University Press. 1934.