Cita APA (7a ed.)

(1994). OPAC directory: An annual guide to Internet-accessible online public access catalogs. Mecklermedia.

Cita Chicago Style (17a ed.)

OPAC Directory: An Annual Guide to Internet-accessible Online Public Access Catalogs. Westport [etc.]: Mecklermedia, 1994.

Cita MLA (9a ed.)

OPAC Directory: An Annual Guide to Internet-accessible Online Public Access Catalogs. Mecklermedia, 1994.