Lenroot-Ernt, L. (1982). Directory of special libraries and information centers. Vol. 1. Directory of special libraries and informations centers in the United States and Canada (7th ed.). Gale Research.
Citace podle Chicago (17th ed.)Lenroot-Ernt, Lois. Directory of Special Libraries and Information Centers. Vol. 1. Directory of Special Libraries and Informations Centers in the United States and Canada. 7th ed. Detroit: Gale Research, 1982.
Citace podle MLA (9th ed.)Lenroot-Ernt, Lois. Directory of Special Libraries and Information Centers. Vol. 1. Directory of Special Libraries and Informations Centers in the United States and Canada. 7th ed. Gale Research, 1982.
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