Courville, D. A. (1971). The Exodus problem and its ramifications. Challenge Books.
Lua i Stíl Chicago (17ú heag.)Courville, Donovan A. The Exodus Problem and Its Ramifications. Challenge Books, 1971.
Lua MLA (9ú heag.)Courville, Donovan A. The Exodus Problem and Its Ramifications. Challenge Books, 1971.
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