Ruhlmann, William (1968-12-06). "Allmusic review". Allmusic.com. Retrieved 2012-09-26.
pitchfork.com
Pitchfork Staff (August 22, 2017). "The 200 Best Albums of the 1960s". Pitchfork. Retrieved April 15, 2023. Most significantly, it marked the first of Wonder's pop albums to feature the clavinet...