APA (7th ed.) Citation

Keeler, E. P. (1927). World trade in paints and varnishes: Porto Rico. [publisher not identified].

Chicago Style (17th ed.) Citation

Keeler, Erwin P. World Trade in Paints and Varnishes: Porto Rico. Washington, D.C.: [publisher not identified], 1927.

MLA (9th ed.) Citation

Keeler, Erwin P. World Trade in Paints and Varnishes: Porto Rico. [publisher not identified], 1927.