APA (7th ed.) Citation

Unckles, R. W. (1927). World trade in paints and varnishes: Costa Rica. [publisher not identified].

Chicago Style (17th ed.) Citation

Unckles, Roderick W. World Trade in Paints and Varnishes: Costa Rica. Washington, D.C.: [publisher not identified], 1927.

MLA (9th ed.) Citation

Unckles, Roderick W. World Trade in Paints and Varnishes: Costa Rica. [publisher not identified], 1927.