Cita APA (7a ed.)

Schoenfeld, M., & Mcpherson, B. (2002). Once Upon a Time. Hal Leonard Music Publishing.

Cita Chicago Style (17a ed.)

Schoenfeld, Mark, y Barri Mcpherson. Once Upon a Time. Wisconsin, United States: Hal Leonard Music Publishing, 2002.

Cita MLA (9a ed.)

Schoenfeld, Mark, y Barri Mcpherson. Once Upon a Time. Hal Leonard Music Publishing, 2002.