"Tonträger." . . . . "Geschichte 1961-1998." . . . "The Billboard book of number one adult contemporary hits" . "The Billboard book of number one adult contemporary hits"@en . . . . . "Discographies" . "Discographies"@en . . . . . . . . . . . . "Hit." . . "Popular music Discography." . . "USA." . . "Verzeichnis." . .