Sheehy, E. P. (1986). Guide to reference books (10th ed.). American Library Association.
Lua i Stíl Chicago (17ú heag.)Sheehy, Eugene Paul. Guide to Reference Books. 10th ed. Chicago: American Library Association, 1986.
Lua MLA (9ú heag.)Sheehy, Eugene Paul. Guide to Reference Books. 10th ed. American Library Association, 1986.
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