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.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (9ú heag.)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.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.