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2. Cajori F. A History o/Mathematical Notations. Volume II Open Court Publishing Co. La Salle Illinois 1929. Cajori F. A History o/Mathematical Notations. Volume II Open Court Publishing Co. La Salle Illinois 1929.
3. The evolution of APL
4. APL Languag e Form No. GC26:3847-4 IBM Corporation. APL Languag e Form No. GC26:3847-4 IBM Corporation.
5. Icerson K.E. Elementary Analysis APL Press Pleasantville N.Y. i976. Icerson K.E. Elementary Analysis APL Press Pleasantville N.Y. i976.