Maguire, D. J., Goodchild, M. F., & Rhind, D. (1991). Geographical information systems, volume 2: Applications. Longman.
Lua i Stíl Chicago (17ú heag.)Maguire, D. J., Michael F. Goodchild, agus David Rhind. Geographical Information Systems, Volume 2: Applications. Harlow, Eng.: Longman, 1991.
Lua MLA (9ú heag.)Maguire, D. J., et al. Geographical Information Systems, Volume 2: Applications. Longman, 1991.
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