Cita APA (7th ed.)

Federal Document Retrieval, Inc. (1989). Directory of periodicals online. Science & technology. Federal Document Retrieval.

Cita Chicago (17th ed.)

Federal Document Retrieval, Inc. Directory of Periodicals Online. Science & Technology. Washington, D.C.: Federal Document Retrieval, 1989.

Cita MLA (8th ed.)

Federal Document Retrieval, Inc. Directory of Periodicals Online. Science & Technology. Federal Document Retrieval, 1989.