APA (7th ed.) Citation

ProQuest (Firm). (1941). Phosphate resources of the United States. [publisher not identified].

Chicago Style (17th ed.) Citation

ProQuest (Firm). Phosphate Resources of the United States. Washington: [publisher not identified], 1941.

MLA (9th ed.) Citation

ProQuest (Firm). Phosphate Resources of the United States. [publisher not identified], 1941.

Warning: These citations may not always be 100% accurate.