詞曲創作、製作 馬克斯·馬丁 – 聲樂製作 Witness by Katy Perry on Apple Music. iTunes Store. [2017-06-03]. (原始内容存档于2017-05-19). Katy Perry. Witness (音像媒体说明). Capitol Records
The Space "Witness" "Roulette" "Dark Horse" "Chained to the Rhythm" Act My Age Interlude "Teenage Dream" "Hot n Cold" "Last Friday Night (T.G.I.F.)" "California