APA (7th ed.) Citation

Humble Oil and Refining Company (Incorporated in Tex.). (1939). Texas through 250,000,000 years. Texas Memorial Museum.

Chicago Style (17th ed.) Citation

Humble Oil and Refining Company (Incorporated in Tex.). Texas Through 250,000,000 Years. Austin: Texas Memorial Museum, 1939.

MLA (9th ed.) Citation

Humble Oil and Refining Company (Incorporated in Tex.). Texas Through 250,000,000 Years. Texas Memorial Museum, 1939.