SZYMANSKI, R. A. Computers and information Systems#Robert A. Szymanski, Donald P. Szymanski, Donna M. Pulschen; Editor P.J.Boardman. Prentice Hall Upper Saddle River.
Chicago (17e ed.) BronvermeldingSZYMANSKI, Robert A. Computers and Information Systems#Robert A. Szymanski, Donald P. Szymanski, Donna M. Pulschen; Editor P.J.Boardman. Prentice Hall Upper Saddle River.
MLA (8e ed.) BronvermeldingSZYMANSKI, Robert A. Computers and Information Systems#Robert A. Szymanski, Donald P. Szymanski, Donna M. Pulschen; Editor P.J.Boardman. Prentice Hall Upper Saddle River.
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