Dyfyniad APA

LeRoy, L. W. (1950). Subsurface geologic methods (2nd ed.). Colorado School of Mines.

Dyfyniad Arddull Chicago

LeRoy, L. W. Subsurface Geologic Methods. 2nd ed. Golden, Colorado: Colorado School of Mines, 1950.

Dyfyniad MLA

LeRoy, L. W. Subsurface Geologic Methods. 2nd ed. Colorado School of Mines, 1950.

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