Text in periodical
«Videotapes for sale and/or exchange». – Radical Software. – Vol. 1, no. 5 [(1972)]. – P. 71-78.
Also available on the Internet. {{www.radicalsoftware.org}}
Text in periodical
«[Advertisement for Video Tape Network]». – Radical Software. – Vol. 2, no. 4 ([1973]). – P. 68-69.
Also available on the Internet. {{www.radicalsoftware.org}}