Cita APA

Leet, L. D. n. 1., Kaufman, M. E., & Sheldon, J. (1987). Physical geology (7. edition.). Englewood Cliffs, N.J.: Prentice Hall.

Citación estilo Chicago

Leet, Lewis Don n. 1901, Marvin E. Kaufman, y Judson Sheldon. Physical Geology. 7. edition. Englewood Cliffs, N.J.: Prentice Hall, 1987.

Cita MLA

Leet, Lewis Don n. 1901, Marvin E. Kaufman, y Judson Sheldon. Physical Geology. 7. edition. Englewood Cliffs, N.J.: Prentice Hall, 1987.