Riechel, R. (1989). Personnel needs and changing reference service. Library Professional Publications.
Lua i Stíl Chicago (17ú heag.)Riechel, Rosemarie. Personnel Needs and Changing Reference Service. Hamden, Conn.: Library Professional Publications, 1989.
Lua MLA (8ú heag.)Riechel, Rosemarie. Personnel Needs and Changing Reference Service. Library Professional Publications, 1989.
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