"Extension of APL to tree-structured information". - Manuel Alfonseca 001; Maria L. Tavera (APL, 1976)

An APL Interpreter and System for a Small Computer. - Manuel Alfonseca 001; Maria L. Tavera; Ramón Casajuana (IBM Syst. J., 1977)

A Machine-Independent APL Interpreter. - Manuel Alfonseca 001; Maria L. Tavera (IBM J. Res. Dev., 1978)

The IBM personal computer APL system. - Maria L. Tavera; Manuel Alfonseca 001; Juan Rojas 002 (APL, 1984)

An APL System for the IBM Personal Computer. - Maria L. Tavera; Manuel Alfonseca 001; Juan Rojas 002 (IBM Syst. J., 1985)