Cromley, R. G. (1992). Digital cartography. Prentice Hall.
Chicago-čujuhus (17. p.)Cromley, Robert G. Digital Cartography. Englewood Cliffs: Prentice Hall, 1992.
MLA-čujuhus (9. p.)Cromley, Robert G. Digital Cartography. Prentice Hall, 1992.
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