Stallman, Richard, and contributors. n.d.-a. “GNU Emacs.” Free Software Foundation. https://www.emacs.org/.
———. n.d.-b. GNU Emacs Manuals Online. Free Software Foundation. https://www.gnu.org/software/emacs/manual/.
———. n.d.-c. “What Is Free Software?” Free Software Foundation. https://www.gnu.org/philosophy/free-sw.en.html.
Stavrou, Protesilaos. n.d. https://protesilaos.com/.
Wilson, David. n.d. “System Crafters.” https://systemcrafters.net/.