APA引文

(1987). National library of medicine current catalog. Maryland: National Library of Medicine.

Trích dẫn kiểu Chicago

National Library of Medicine Current Catalog. Maryland: National Library of Medicine, 1987.

MLA引文

National Library of Medicine Current Catalog. Maryland: National Library of Medicine, 1987.

警告：这些引文格式不一定是100％准确.