Cita APA (7th ed.)

HOLMES, A. Principles of physical geology chapter XX-XXI(619-1288).-- 2nd ed. ELBS and Nelson.

Cita Chicago (17th ed.)

HOLMES, Arthur. Principles of Physical Geology Chapter XX-XXI(619-1288).-- 2nd Ed. London: ELBS and Nelson.

Cita MLA (9th ed.)

HOLMES, Arthur. Principles of Physical Geology Chapter XX-XXI(619-1288).-- 2nd Ed. ELBS and Nelson.