Williams, B. K., & Sawyer, S. C. (2005). Using information technology: Practical introduction to computers & communications complete version (Sixth edition.). McGraw-Hill Technology Education.

Williams, Brian K., and Stacey C. Sawyer. Using Information Technology: Practical Introduction to Computers & Communications Complete Version. Sixth edition. Boston: McGraw-Hill Technology Education, 2005.

Williams, Brian K., and Stacey C. Sawyer. Using Information Technology: Practical Introduction to Computers & Communications Complete Version. Sixth edition. McGraw-Hill Technology Education, 2005.