APA

Mitchell D. R., . (1950). Coal preparation. New York: The American Institute of Mining and Metallurgical engineers.

Chicago

Mitchell David R, . 1950. Coal preparation. New York: The American Institute of Mining and Metallurgical engineers.

Harvard

Mitchell D. R., . (1950). Coal preparation. New York: The American Institute of Mining and Metallurgical engineers.

MLA

Mitchell David R, . Coal preparation. New York: The American Institute of Mining and Metallurgical engineers. 1950.