APA (7th ed.) Citation

United States. Department of Commerce. (1920). Natural hydrocarbons: Gilsonite, elaterite, wurtzilite, grahamite, ozokerite and others. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Department of Commerce. Natural Hydrocarbons: Gilsonite, Elaterite, Wurtzilite, Grahamite, Ozokerite and Others. [Washington]: [publisher not identified], 1920.

MLA (9th ed.) Citation

United States. Department of Commerce. Natural Hydrocarbons: Gilsonite, Elaterite, Wurtzilite, Grahamite, Ozokerite and Others. [publisher not identified], 1920.