Campbell, H. C. (1982). Developing public library systems and services: A guide to the organization of national and regional public library systems as a part of overall national information service planning. Unesco.
Chicago-referens (17:e uppl.)Campbell, H. C. Developing Public Library Systems and Services: A Guide to the Organization of National and Regional Public Library Systems as a Part of Overall National Information Service Planning. Paris: Unesco, 1982.
MLA-referens (9:e uppl.)Campbell, H. C. Developing Public Library Systems and Services: A Guide to the Organization of National and Regional Public Library Systems as a Part of Overall National Information Service Planning. Unesco, 1982.
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