^Considine, J.D.; Coleman, Mark; Evans, Paul; McGee, David (1992). "Gladys Knight and the Pips". In DeCurtis, Anthony; Henke, James; George-Warren, Holly (eds.). Rolling Stone Album Guide. New York: Random House. pp. 163–164.
^Whitburn, Joel (2004). The Billboard Book of Top 40 Hits: Eighth Edition. Record Research. p. 205.