Anon (1999-07-01). "News and notes. National Library of Medicine unveils web-based online catalog". Public Health Reports. 114 (4): 300. doi:10.1093/phr/114.4.300. ISSN1468-2877.
Anon (1999-07-01). "News and notes. National Library of Medicine unveils web-based online catalog". Public Health Reports. 114 (4): 300. doi:10.1093/phr/114.4.300. ISSN1468-2877.