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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC340963/.
Doyle, Helen (2004). "Public Library of Science (PLoS): Committed to Making the World's Scientific and Medical Literature A Public Resource" (Document). pp. 9–10. {{cite document}}: Cite documentでは|publisher=が必須です。 (説明); 不明な引数|format=は無視されます。 (説明); 不明な引数|journal=は無視されます。 (説明); 不明な引数|number=は無視されます。 (説明); 不明な引数|url=は無視されます。 (説明)
Doyle, Helen J (2004). “The Public Library of Science—Open Access from the Ground Up.”. College & Research Libraries News 65 (3): 134–136. http://www.ala.org/ala/acrl/acrlpubs/crlnews/backissues2004/march04/publiclibraryscience.htm.
Eaton, L. (2003). “"Free" medical publishing venture gets under way”.