Prescott, J. R. V. (1967). The geography of frontiers and boundaries. Hutchinson university library.
Cita Chicago Style (17a ed.)Prescott, John Robert Víctor. The Geography of Frontiers and Boundaries. London: Hutchinson university library, 1967.
Cita MLA (9a ed.)Prescott, John Robert Víctor. The Geography of Frontiers and Boundaries. Hutchinson university library, 1967.
Precaución: Estas citas no son 100% exactas.