Não informado. (1987). National Business Education Yearbook. National Business Education Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. National Business Education Yearbook. Reston, Va: National Business Education Association, 1987.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. National Business Education Yearbook. National Business Education Association, 1987.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.