APA (7th ed.) Citation

Philipson, W. R. (1939). An enumeration of the tropical African species of Centaurea ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Philipson, William Raymond. An Enumeration of the Tropical African Species of Centaurea. [Sonderdr.]. 1939.

MLA (9th ed.) Citation

Philipson, William Raymond. An Enumeration of the Tropical African Species of Centaurea. [Sonderdr.]. 1939.

Warning: These citations may not always be 100% accurate.