Archive document : File [Lui, Chi Tien]. – 1975. – One element. – File. – The person who processed the documents established the arrangement of items. – Includes one letter.
Text in periodical «A Radical Software state-of-the-art report». – Radical Software. – Vol. 1, no. 5 [(1972)]. – P. 109-115. Also available on the Internet. {{www.radicalsoftware.org}}