Definition and picture pick from Wikipedia and encyclopedia.
1. Robinson, A.H. (1953). Elements of Cartography. New York: John Wiley & Sons.
2. Robinson, Arthur H. (1982). Early Thematic Mapping in the History of Cartography. Chicago: The University of Chicago Press.
3. Hargett, James M. "Song Dynasty Local Gazetteers and Their Place in The History of Difangzhi Writing," Harvard Journal of Asiatic Studies (Volume 56, Number 2, 1996): 405–442.
4. Harley, J. B., and David Woodward, eds. (1987) Cartography in Prehistoric, Ancient, and Medieval Europe and the Mediterranean. Volume 1 of The History of Cartography. Chicago and London: University of Chicago Press. ISBN 0-226-31633-5.
5. Harley, J. B., and David Woodward, eds. (1992) Cartography in the Traditional Islamic and South Asian Societies. Volume 2, Book 1 of The History of Cartography. Chicago and London: University of Chicago Press. ISBN 0-226-31635-1.