Schoenfeld, M., & Mcpherson, B. (2002). Once Upon a Time. Hal Leonard Music Publishing.
Lua i Stíl Chicago (17ú heag.)Schoenfeld, Mark, agus Barri Mcpherson. Once Upon a Time. Wisconsin, United States: Hal Leonard Music Publishing, 2002.
Lua MLA (9ú heag.)Schoenfeld, Mark, agus Barri Mcpherson. Once Upon a Time. Hal Leonard Music Publishing, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.