Text in periodical
Gillette, Frank. – «Random notes on the special case or (loop-de-loop)». – Radical Software. – Vol. 1, no. 1 [(1970)]. – P. 6.
Also available on the Internet. {{www.radicalsoftware.org}}
Text in periodical
«Game shows». – Radical Software. – Vol. 2, no. 2 [(1973)]. – P. 6-8.
Also available on the Internet. {{www.radicalsoftware.org}}