APA引文

Gardner, E. D., & Johnson, C. H. (1934). Placer mining in the western United States. U.S. Bureau of Mines.

Chicago Style (17th ed.) Citation

Gardner, E. D., and Charles H. Johnson. Placer Mining in the Western United States. [Tucson?, Ariz.]: U.S. Bureau of Mines, 1934.

MLA引文

Gardner, E. D., and Charles H. Johnson. Placer Mining in the Western United States. U.S. Bureau of Mines, 1934.

警告：這些引文格式不一定是100％准確.