by Richard M. Highsmith, Jr.... [et.al.]
Prentice-Hall, 1961
Buku Teks
Knox, Paul, author
Edward Arnold , 1994
Buku Teks
Pounds, Norman J. G., author
Silver Burdett, 1980
Buku Teks
Spidchenko, K.
Progress , 1972
Buku Teks
prepared by the Cartographic Department of the Clarendon Press
Oxford University Press, 1972
Buku Referensi