APA استشهاد

Legget, R. F. (1973). Cities and Geology. McGraw-Hill.

استشهاد بنمط شيكاغو

Legget, Robert F. Cities and Geology. New York: McGraw-Hill, 1973.

MLA استشهاد

Legget, Robert F. Cities and Geology. McGraw-Hill, 1973.