Cita APA

National Library of Medicine (U.S.). (1990). Medical subject headings: Supplement to Index Medicus Volume 31, 1990. U.S. Dept. of Health and Human Services. National Library of Medicine.

Citación estilo Chicago

National Library of Medicine (U.S.). Medical Subject Headings: Supplement to Index Medicus Volume 31, 1990. [Bethesda: U.S. Dept. of Health and Human Services. National Library of Medicine, 1990.

Cita MLA

National Library of Medicine (U.S.). Medical Subject Headings: Supplement to Index Medicus Volume 31, 1990. U.S. Dept. of Health and Human Services. National Library of Medicine, 1990.