Zoehfeld, K. W., & Hale, J. G. (1995). How mountains are made. HarperCollins.
Cita Chicago Style (17a ed.)Zoehfeld, Kathleen Weidner, y James Graham Hale. How Mountains Are Made. New York, NY: HarperCollins, 1995.
Cita MLA (8a ed.)Zoehfeld, Kathleen Weidner, y James Graham Hale. How Mountains Are Made. HarperCollins, 1995.
Precaución: Estas citas no son 100% exactas.