Não informado. (1967). MSU business topics. Michigan State University, Bureau of Business and Economic Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. MSU Business Topics. East Lansing, Mich: Michigan State University, Bureau of Business and Economic Research, 1967.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. MSU Business Topics. Michigan State University, Bureau of Business and Economic Research, 1967.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.