Cita APA (7th ed.)

YIH-LONG CHANG & SULLIVAN, R. S. (1989). QSB+: Quantitative systems for business plus. Prentice Hall.

Cita Chicago (17th ed.)

YIH-LONG CHANG i Robert S. SULLIVAN. QSB+: Quantitative Systems for Business Plus. Englewood Cliffs: Prentice Hall, 1989.

Cita MLA (9th ed.)

YIH-LONG CHANG i Robert S. SULLIVAN. QSB+: Quantitative Systems for Business Plus. Prentice Hall, 1989.