Não informado. Data book electronic information series. Derivation and Tabulation Associates.
Chicago-referens (17:e uppl.)Não informado. Data Book Electronic Information Series. San Diego, Calif: Derivation and Tabulation Associates.
MLA-referens (8:e uppl.)Não informado. Data Book Electronic Information Series. Derivation and Tabulation Associates.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.