Gaya APA

Lefond, , S, J. (1975). Industrial minerals and rocks : nonmetallics other than fuels (4th ed). New York: American Institute of Mining, Metallurgical, and Petroleum Engineers.

Gaya MLA

Lefond, , Staley, J.. "Industrial minerals and rocks : nonmetallics other than fuels". 4th ed New York: American Institute of Mining, Metallurgical, and Petroleum Engineers, 1975. Text.