Klein, B. (1975). Guide to American directories: A guide to the major business directories of the United States, covering all industrial, professional and mercantile categories (9th ed.). B. Klein Publications.
Citace podle Chicago (17th ed.)Klein, Bernard. Guide to American Directories: A Guide to the Major Business Directories of the United States, Covering All Industrial, Professional and Mercantile Categories. 9th ed. Coral Springs, Fla.: B. Klein Publications, 1975.
Citace podle MLA (8th ed.)Klein, Bernard. Guide to American Directories: A Guide to the Major Business Directories of the United States, Covering All Industrial, Professional and Mercantile Categories. 9th ed. B. Klein Publications, 1975.
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