Cita APA (7a ed.)

Harbaugh, J. W. (1968). Stratigraphy and geologic time. W. C. Brown Co.

Cita Chicago Style (17a ed.)

Harbaugh, John Warvelle. Stratigraphy and Geologic Time. Dubuque, Iowa: W. C. Brown Co, 1968.

Cita MLA (9a ed.)

Harbaugh, John Warvelle. Stratigraphy and Geologic Time. W. C. Brown Co, 1968.