Text in periodical
«Video directory». – Radical Software. – Vol. 1, no. 5 [(1972)]. – P. 94-107.
Also available on the Internet. {{www.radicalsoftware.org}}
Text in periodical
«Brought to you by:». – Radical Software. – Vol. 2, no. 4 ([1973]). – P. [71].
Also available on the Internet. {{www.radicalsoftware.org}}