COMTON'S. (1985). Comton's precyclopedia v.3. Encyclopedia Britanica.
Lua i Stíl Chicago (17ú heag.)COMTON'S. Comton's Precyclopedia V.3. Britania: Encyclopedia Britanica, 1985.
Lua MLA (9ú heag.)COMTON'S. Comton's Precyclopedia V.3. Encyclopedia Britanica, 1985.
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