APA (7th ed.) Citation

(1950). Trinidad showing the location of the principal oil producing areas. [publisher not identified].

Chicago Style (17th ed.) Citation

Trinidad Showing the Location of the Principal Oil Producing Areas. [Place of publication not identified]: [publisher not identified], 1950.

MLA (9th ed.) Citation

Trinidad Showing the Location of the Principal Oil Producing Areas. [publisher not identified], 1950.