American Library Association. Government Documents Round Table, Cline, N., & Heymann, J. (1978). Directory of government document collections & librarians (2d ed.). Congressional Information Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)American Library Association. Government Documents Round Table, Nancy Cline, και Jaia Heymann. Directory of Government Document Collections & Librarians. 2d ed. Washington, D.C.: Congressional Information Service, 1978.
Παραπομπή σε μορφή MLA (8th εκδ.)American Library Association. Government Documents Round Table, et al. Directory of Government Document Collections & Librarians. 2d ed. Congressional Information Service, 1978.
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