Niemann, B. J., McLaughlin, J. D., & Dahlberg, R. E. (1989). Developments in land information management. Institute for Land Information.
Lua i Stíl Chicago (17ú heag.)Niemann, Bernard J., John D. McLaughlin, agus R. E. Dahlberg. Developments in Land Information Management. Washington, D.C.: Institute for Land Information, 1989.
Lua MLA (8ú heag.)Niemann, Bernard J., et al. Developments in Land Information Management. Institute for Land Information, 1989.
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