Text in periodical
Paskal, Merrily. – «Video soma feedback». – Radical Software. – Vol. 1, no. 5 [(1972)]. – P. 20-21.
Also available on the Internet. {{www.radicalsoftware.org}}
Text in periodical
«Program guide». – Radical Software. – Vol. 2, no. 1 [(1972)]. – P. [1-2].
Also available on the Internet. {{www.radicalsoftware.org}}