Issue No.04 - April (1978 vol.11)
Heathkit Catalog. Winter 78 edition with 104 pages of electronic kits and products including home entertainment equipment, personal computers, radio accessories, and test instruments available from Heath Co., Dept. 350-530, Benton Harbor, MI 49022.
"New Literature", Computer, vol.11, no. 4, pp. 102, April 1978, doi:10.1109/C-M.1978.218153