APA (7th ed.) Citation

Clarkson, K., & Legend, J. (2015). Piece by piece. RCA Records.

Chicago Style (17th ed.) Citation

Clarkson, Kelly, and John Legend. Piece by Piece. [New York, NY]: RCA Records, 2015.

MLA (8th ed.) Citation

Clarkson, Kelly, and John Legend. Piece by Piece. RCA Records, 2015.

Warning: These citations may not always be 100% accurate.