Hey, Tony; Pápay, Gyuri (2014). The Computing Universe: A Journey through a Revolution. Cambridge University Press. p.76. ISBN978-1-31612322-5, "A major characteristic of modern scripting languages is their interactivity, sometimes referred to as a REPL programming environment. ... The characteristics of ease of use and immediate execution with a REPL environment are sometimes taken as the definition of a scripting language."
