De Blij, H. J. (1967). Systematic political geography. John Wiley r Sons.
Chicago Style (17th ed.) CitationDe Blij, Harm J. Systematic Political Geography. John Wiley r Sons, 1967.
MLA (8th ed.) CitationDe Blij, Harm J. Systematic Political Geography. John Wiley r Sons, 1967.
Warning: These citations may not always be 100% accurate.