Text in periodical
«Video directory». – Radical Software. – Vol. 2, no. 1 [(1972)]. – P. 57-62.
Also available on the Internet. {{www.radicalsoftware.org}}
Text in periodical
«VT program guide». – Radical Software. – Vol. 2, no. 5 ([1973]). – P. [46-51].
Also available on the Internet. {{www.radicalsoftware.org}}