Citazione Stile APA (7a Edizione)

Petersen, M. S. (1980). Historical geology of North America (2nd ed.). W. C. Brown Co.

Citazione stile Chigago Style (17a edizione)

Petersen, Morris S. Historical Geology of North America. 2nd ed. Dubuque, Iowa: W. C. Brown Co, 1980.

Citatione MLA (9a ed.)

Petersen, Morris S. Historical Geology of North America. 2nd ed. W. C. Brown Co, 1980.