APA引文

Cooper John D. (1990). A trip through time: Principles of historical geology (2nd ed.). Merril Publishing company.

Chicago Edition Citation

Cooper John D. A Trip Through Time: Principles of Historical Geology. 2nd ed. London: Merril Publishing company, 1990.

MLA引文

Cooper John D. A Trip Through Time: Principles of Historical Geology. 2nd ed. Merril Publishing company, 1990.

警告：這些引文格式不一定是100％准確.