Cromley, R. G. (1992). Digital cartography. Prentice Hall.
Tohutoru Kātū Chicago (17th ed.)Cromley, Robert G. Digital Cartography. Englewood Cliffs: Prentice Hall, 1992.
Tohutoro MLA (9th ed.)Cromley, Robert G. Digital Cartography. Prentice Hall, 1992.
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