RITCHIE, D. A. (1985). Heritage Of Freedom History Of The United States Donald A. Ritchie. Macmillan Publishing Company.
Lua i Stíl Chicago (17ú heag.)RITCHIE, Donald A. Heritage Of Freedom History Of The United States Donald A. Ritchie. Macmillan Publishing Company, 1985.
Lua MLA (8ú heag.)RITCHIE, Donald A. Heritage Of Freedom History Of The United States Donald A. Ritchie. Macmillan Publishing Company, 1985.
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