THORPE EDGAR. (1999). GENERAL KNOWLEDGE MANUAL. A H WHEELER & CO.
Lua i Stíl Chicago (17ú heag.)THORPE EDGAR. GENERAL KNOWLEDGE MANUAL. NEW DELHI: A H WHEELER & CO, 1999.
Lua MLA (9ú heag.)THORPE EDGAR. GENERAL KNOWLEDGE MANUAL. A H WHEELER & CO, 1999.
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