Text in periodical
«Program guide». – Radical Software. – Vol. 2, no. 1 [(1972)]. – P. [1-2].
Also available on the Internet. {{www.radicalsoftware.org}}
Text in periodical
«Spare reel directory». – Radical Software. – Vol. 2, no. 5 ([1973]). – P. 52-56.
Also available on the Internet. {{www.radicalsoftware.org}}