APA (7th ed.) Citation

Hopkins, G. R. (1926). Movement of oil through Panama Canal. [publisher not identified].

Chicago Style (17th ed.) Citation

Hopkins, G. R. Movement of Oil Through Panama Canal. Washington, D.C.: [publisher not identified], 1926.

MLA (9th ed.) Citation

Hopkins, G. R. Movement of Oil Through Panama Canal. [publisher not identified], 1926.