Cita APA (7th ed.)

Gardiner, C. (1994). An introduction to geology. DPH.

Cita Chicago (17th ed.)

Gardiner, C.I. An Introduction to Geology. New Delhi: DPH, 1994.

Cita MLA (9th ed.)

Gardiner, C.I. An Introduction to Geology. DPH, 1994.