information and computer security:
Book: Cryptography and network security: Principles and practice (5th edition), william stallings
e-systems
book: Efraim turban n, jae k. Lee, ting-peng liang, deborrah turban, electronic commerce: A managerial perspective 2010 , prentice hall, 2010
decision support systems
book: Turban, ramesh sharda, dursun delen, "decision support and business intelligence systems", prenticehall, 9 edition, 2010