Cassel, D. (1986). Lotus 1-2-3 simplified for the IBM personal computer. Prentice-Hall.
Dyfyniad Arddull ChicagoCassel, Don. Lotus 1-2-3 Simplified for the IBM Personal Computer. Englewood Cliffs, N. J: Prentice-Hall, 1986.
Dyfyniad MLACassel, Don. Lotus 1-2-3 Simplified for the IBM Personal Computer. Prentice-Hall, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.