Cita APA (7a ed.)

Leonard, J. W., & Hardinge, B. C. (1991). Coal preparation (5th ed.). Society for Mining, Metallurgy, and Exploration.

Cita Chicago Style (17a ed.)

Leonard, Joseph W., y Byron C. Hardinge. Coal Preparation. 5th ed. Littleton, Colo.: Society for Mining, Metallurgy, and Exploration, 1991.

Cita MLA (8a ed.)

Leonard, Joseph W., y Byron C. Hardinge. Coal Preparation. 5th ed. Society for Mining, Metallurgy, and Exploration, 1991.