Cita APA (7a ed.)

National Library of Medicine (U.S.). (1968). Guide to MEDLARS services ([Rev.].).

Cita Chicago Style (17a ed.)

National Library of Medicine (U.S.). Guide to MEDLARS Services. [Rev.]. Bethesda, Md, 1968.

Cita MLA (8a ed.)

National Library of Medicine (U.S.). Guide to MEDLARS Services. [Rev.]. 1968.