O'Leary, T. J., & O'Leary, L. I. (1994). Lotus 1-2-3: Release 4 for windows. McGraw-Hill.

O'Leary, Timothy J., and Linda I. O'Leary. Lotus 1-2-3: Release 4 for Windows. New York: McGraw-Hill, 1994.

O'Leary, Timothy J., and Linda I. O'Leary. Lotus 1-2-3: Release 4 for Windows. McGraw-Hill, 1994.