एपीए उद्धरण

(1991). Reference and information services: An introduction. Englewood, Colorado: Libraries Unlimited, Inc.

शिकागो स्टाइल उद्धरण

Reference and Information Services: An Introduction. Englewood, Colorado: Libraries Unlimited, Inc, 1991.

एमएलए उद्धरण

Reference and Information Services: An Introduction. Englewood, Colorado: Libraries Unlimited, Inc, 1991.