Cassette Rampage Forecast. Billboard magazine (Nielsen Business Media, Inc.). 1967-11-04, 79 (44): 1,72. ISSN 0006-2510(英语).使用|accessdate=需要含有|url= (帮助)
European Mfrs. Bid for Market Share. Billboard magazine (Nielsen Business Media, Inc.). 1967-04-08, 79 (14): 18. ISSN 0006-2510(英语).使用|accessdate=需要含有|url= (帮助)
Mercury Issues 49 'Cassettes'. Billboard magazine (Nielsen Business Media, Inc.). 1966-07-16, 78 (29): 69. ISSN 0006-2510(英语).使用|accessdate=需要含有|url= (帮助)