Gaya APA

Hutton, C, A. (1982). Cleaning Up Coal: A Study of Coal Cleaning and the Use of Cleaned Coal . New York: Ballinger Publishing Company.

Gaya MLA

Hutton, Cynthia, A.. "Cleaning Up Coal: A Study of Coal Cleaning and the Use of Cleaned Coal". New York: Ballinger Publishing Company, 1982. Text.