APA
(1980). Medical Subject Headings. U.S.A: National Institutes of Health.
Chicago
1980. Medical Subject Headings. U.S.A: National Institutes of Health.
Harvard
(1980). Medical Subject Headings. U.S.A: National Institutes of Health.
MLA
Medical Subject Headings. U.S.A: National Institutes of Health. 1980.