Dyfyniad APA

Kennedy, B. A. (1990). Surface mining (2a. ed.). Society for Mining, Metallurgy and Exploration, Inc.

Dyfyniad Arddull Chicago

Kennedy, Bruce A. Surface Mining. 2a. ed. Littleton: Society for Mining, Metallurgy and Exploration, Inc, 1990.

Dyfyniad MLA

Kennedy, Bruce A. Surface Mining. 2a. ed. Society for Mining, Metallurgy and Exploration, Inc, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.