Sutherland, I. E.. «Sketchpad: A Man-Machine Graphical Communication System». Technical Report No. 296, Lincoln Laboratory, Massachusetts Institute of Technology via Defense Technical Information Center (stinet.dtic.mil), 30-01-1963. Arxivat de l'original el 8 April 2013. [Consulta: 17 juliol 2019].
foxprohistory.org
1995 (June) Visual FoxPro 3.0, FoxPro evolves from a procedural language to an object-oriented language. Visual FoxPro 3.0 introduces a database container, seamless client/server capabilities, support for ActiveX technologies, and OLE Automation and null support. Summary of Fox releases
McCarthy, J.; Brayton, R.; Edwards, D.; Fox, P.; Hodes, L.; Luckham, D.; Maling, K.; Park, D.; Russell, S. «LISP I Programmers Manual». . Artificial Intelligence Group, M.I.T. Computation Center and Research Laboratory, 3-1969, pàg. 88f. «In the local M.I.T. patois, association lists [of atomic symbols] are also referred to as "property lists", and atomic symbols are sometimes called "objects".»
Sutherland, I. E.. «Sketchpad: A Man-Machine Graphical Communication System». Technical Report No. 296, Lincoln Laboratory, Massachusetts Institute of Technology via Defense Technical Information Center (stinet.dtic.mil), 30-01-1963. Arxivat de l'original el 8 April 2013. [Consulta: 17 juliol 2019].