Editing APL (programming language) (section)

=== APLGOL ===
In 1972, APLGOL was released as an experimental version of APL that added structured programming language constructs to the language framework. New statements were added for interstatement control, conditional statement execution, and statement structuring, as well as statements to clarify the intent of the algorithm.<ref>{{cite journal | author=Kelley, R.A.|title=APLGOL, an Experimental Structured Programming Language|year=1973 |journal=IBM Journal of Research and Development|volume=17 |pages=69–73 |doi=10.1147/rd.171.0069 |url=https://ieeexplore.ieee.org/document/5391426/authors#authors|url-access=subscription}}</ref> It was implemented for Hewlett-Packard in 1977.<ref>{{cite web | author=Johnston, Ronald L.|title=APLGOL: Structured Programming Facilities for APL|date=July 1977 |publisher=Hewlett-Packard Journal|url=https://archive.org/details/Hewlett-Packard_Journal_Vol._28_No._11_1977-07_Hewlett-Packard/page/n9/mode/2up}}</ref>