Não informado. (1980). Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences.
Chicago-referens (17:e uppl.)Não informado. Proceedings of the National Academy of Sciences of the United States of America. Washington: National Academy of Sciences, 1980.
MLA-referens (8:e uppl.)Não informado. Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.