Dyfyniad APA

Petersen, M. S., & Rigby, J. K. (1970). Interpreting earth history, a manual in historical geology. W. C. Brown Co..

Dyfyniad Arddull Chicago

Petersen, Morris S., and J. Keith Rigby. Interpreting Earth History, a Manual in Historical Geology. Dubuque, Iowa: W. C. Brown Co., 1970.

Dyfyniad MLA

Petersen, Morris S., and J. Keith Rigby. Interpreting Earth History, a Manual in Historical Geology. W. C. Brown Co., 1970.

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