Cita APA (7th ed.)
Cox, D. P., & Cox, H. R. (1965). Geology principles and concepts. W. H. Freeman and Company.
Cita Chicago (17th ed.)
Cox, Dennis P., i Helen R. Cox. Geology Principles and Concepts. san Francisco: W. H. Freeman and Company, 1965.
Cita MLA (9th ed.)
Cox, Dennis P., i Helen R. Cox. Geology Principles and Concepts. W. H. Freeman and Company, 1965.
Atenció: Aquestes cites poden no estar 100% correctes.