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It was originally recorded by The Moonglows, the group of which Fuqua was a member and Freed was the manager. The Moonglows' version reached number one on the Billboard R&B chart and number 20 on the Billboard Juke Box chart. After it became known that Freed often insisted on songwriter credits for songs by bands he promoted (which partially led to his downfall in a payola investigation years later), Fuqua noted that Freed had in fact contributed to the songwriting for "Sincerely", thus his claim to a songwriting credit in this case was legitimate.
- Gilliland, John (1969). "Show 11: Big Rock Candy Mountain: Early Rock 'n' Roll Vocal Groups & Frank Zappa" (audio). Pop Chronicles. University of North Texas Libraries. Track 5.
- Whitburn, Joel (2004). Top R&B/Hip-Hop Singles: 1942–2004. Record Research. p. 411.
- Whitburn, Joel (2004). The Billboard Book of Top 40 Hits (8th ed.). New York: Billboard Books. p. 414. ISBN 0-8230-7499-4.
- "Hot Country Songs - Forester Sisters Chart History". Billboard. Retrieved June 27, 2018.