Citazione Stile APA (7a Edizione)
ebrary, Inc, Leonard, J. W., & Hardinge, B. C. (1991). Coal preparation (5th ed.). Society for Mining, Metallurgy, and Exploration.
Citazione stile Chigago Style (17a edizione)
ebrary, Inc, Joseph W. Leonard, e Byron C. Hardinge. Coal Preparation. 5th ed. Littleton, Colo.: Society for Mining, Metallurgy, and Exploration, 1991.
Citatione MLA (9a ed.)
ebrary, Inc, et al. Coal Preparation. 5th ed. Society for Mining, Metallurgy, and Exploration, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.