Pettijohn, T. F. (1994). Sources. Dushkin Pub. Group.
Lua i Stíl Chicago (17ú heag.)Pettijohn, Terry F. Sources. Guilford, Conn.: Dushkin Pub. Group, 1994.
Lua MLA (8ú heag.)Pettijohn, Terry F. Sources. Dushkin Pub. Group, 1994.
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