APA (7th ed.) Citation

Smith, G. (1926). World trade in prepared medicines: British Guiana. [publisher not identified].

Chicago Style (17th ed.) Citation

Smith, Gaston. World Trade in Prepared Medicines: British Guiana. Washington, D.C.: [publisher not identified], 1926.

MLA (9th ed.) Citation

Smith, Gaston. World Trade in Prepared Medicines: British Guiana. [publisher not identified], 1926.