Gaya APA

VALACICH, J, S., GEORGE, J, F. (2021). MODERN SYSTEMS ANALYSIS AND DESIGN, NINTH EDITION (ED. 9). NEW YORK: PEARSON EDUCATION LIMITED.

Gaya MLA

VALACICH, JOSEPH, S.., GEORGE, JOEY, F.. "MODERN SYSTEMS ANALYSIS AND DESIGN, NINTH EDITION". ED. 9 NEW YORK: PEARSON EDUCATION LIMITED, 2021. Text.