Não informado. (1987). National Business Education Yearbook. National Business Education Association.
Lua i Stíl Chicago (17ú heag.)Não informado. National Business Education Yearbook. Reston, Va: National Business Education Association, 1987.
Lua MLA (8ú heag.)Não informado. National Business Education Yearbook. National Business Education Association, 1987.
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