APA (7th ed.) Citation

Blackwelder, E., Smith, W. D., & Iddings, J. P. (1910). Regional geology of the United States of North America. C. Winter; C. E. Stechert & co..

Chicago Style (17th ed.) Citation

Blackwelder, Eliot, Warren D. Smith, and Joseph Paxson Iddings. Regional Geology of the United States of North America. Heidelberg : New York: C. Winter; C. E. Stechert & co., 1910.

MLA (9th ed.) Citation

Blackwelder, Eliot, et al. Regional Geology of the United States of North America. C. Winter; C. E. Stechert & co., 1910.