↑ Dimery, Robert (2011). Hachette UK, biên tập. 1001 Songs: You Must Hear Before You Die. "this seven-minute single (a U.S. No. 1) and its near-twelve-minute album version remain the apex of the psychedelic soul era."
↑ Clifford, Tyler. “Local legendary Motown Sound trumpeter Maurice Davis dies at the age of 71”. Wxyz.com. The E.W. Scripps Co. Truy cập ngày 16 tháng 7 năm 2013. "Maurice Davis was involved in producer Norman Whitfield's transition of the Motown Sound into a psychedelic soul label. Whitfield placed much emphasize on instrumentation over vocals, which allowed Davis and the Funk Brothers to shine. The Temptations were a major element in this endeavor, including the production of "Papa Was a Rollin' Stone.""
