Ulrich Adelt, "Machines with a Heart: German Identity in the Music of Can and Kraftwerk", Popular Music and Society, 2012, DOI:10.1080/03007766.2011.567908.
2011년 1월 27일에 확인함.  Ulrich Adelt, "Machines with a Heart: German Identity in the Music of Can and Kraftwerk", Popular Music and Society, 2012, DOI:10.1080/03007766.2011.567908.