Westlake, D. R., & Clarke, J. E. (1987). Geac: A guide for librarians and systems managers. Gower.
Lua i Stíl Chicago (17ú heag.)Westlake, Duncan R., agus John E. Clarke. Geac: A Guide for Librarians and Systems Managers. Aldershot, Hants, England: Gower, 1987.
Lua MLA (9ú heag.)Westlake, Duncan R., agus John E. Clarke. Geac: A Guide for Librarians and Systems Managers. Gower, 1987.
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