Cita APA (7a ed.)

Duval, B. K., & Main, L. The Online Public Access Catalog (OPAC). Automated Library Systems : A Librarian's Guide and Teaching Manual..

Cita Chicago Style (17a ed.)

Duval, Beverly K., y Linda Main. "The Online Public Access Catalog (OPAC)." Automated Library Systems : A Librarian's Guide and Teaching Manual. .

Cita MLA (9a ed.)

Duval, Beverly K., y Linda Main. "The Online Public Access Catalog (OPAC)." Automated Library Systems : A Librarian's Guide and Teaching Manual., .