توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Lyell, C. (1969). Principles of geology, being an attempt to explain the former: Changes of the earth's surface by reference to causes now in operation. Johnson Reprint Corp..

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Lyell, Charles. Principles of Geology, Being an Attempt to Explain the Former: Changes of the Earth's Surface by Reference to Causes Now in Operation. New York: Johnson Reprint Corp., 1969.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Lyell, Charles. Principles of Geology, Being an Attempt to Explain the Former: Changes of the Earth's Surface by Reference to Causes Now in Operation. Johnson Reprint Corp., 1969.