Wilmore, . A., & Rev by Payne, E. R. (1965). The groundwork of modern geography (5th ed.). Bell.
Cita Chicago (17th ed.)Wilmore, Albert, i Ethel R. Rev by Payne. The Groundwork of Modern Geography. 5th ed. London,: Bell, 1965.
Cita MLA (9th ed.)Wilmore, Albert, i Ethel R. Rev by Payne. The Groundwork of Modern Geography. 5th ed. Bell, 1965.
Atenció: Aquestes cites poden no estar 100% correctes.