Van Valkenburg, S. (1943). Elements of political geography. Prentice-Hall.
Chicago Style (17th ed.) CitationVan Valkenburg, Samuel. Elements of Political Geography. New York: Prentice-Hall, 1943.
MLA引文Van Valkenburg, Samuel. Elements of Political Geography. Prentice-Hall, 1943.
警告:這些引文格式不一定是100%准確.