Não informado. (1960). Canadian Petroleum. Hugh C. Maclean Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Canadian Petroleum. Don Mills, Canada: Hugh C. Maclean Publications, 1960.
Lua MLA (8ú heag.)Não informado. Canadian Petroleum. Hugh C. Maclean Publications, 1960.
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