Carr-Ruffino, N. (1988). The business student's guide. Ginn Press.
Lua i Stíl Chicago (17ú heag.)Carr-Ruffino, Norma. The Business Student's Guide. Needham Heights, Massachussetts: Ginn Press, 1988.
Lua MLA (9ú heag.)Carr-Ruffino, Norma. The Business Student's Guide. Ginn Press, 1988.
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