Becker, R.A., J.M. Chambers, and A.R. Wilks. 1988. The New S Language: a Programming Environment for Data Analysis and Graphics. Wadsworth.

Chen, H., and W.-M. Ching. 2013. “ELI: a simple system for Array Programming.” Vector 26 (1).

Helzer, G. 1989. An Encyclopedia of APL. Second. St. Albans, G.B.: I-APL LTD.

IBM. 1988. APL2 Programming: Language Reference. Fourth. San Jose, California: IBM.

Iverson, K. 1962. A Programming Language. Wiley.