APA (7e ed.) Bronvermelding

Chang, Y., & Sullivan, R. S. (1991). QSB+: Quantitative systems for business plus, version 2.0. Prentice-Hall.

Chicago (17e ed.) Bronvermelding

Chang, Yih-Long, en Robert S. Sullivan. QSB+: Quantitative Systems for Business Plus, Version 2.0. Englewood Cliffs: Prentice-Hall, 1991.

MLA (9e ed.) Bronvermelding

Chang, Yih-Long, en Robert S. Sullivan. QSB+: Quantitative Systems for Business Plus, Version 2.0. Prentice-Hall, 1991.