Cita APA (7a ed.)

Walls, C., & Breidenbach, R. (2005). Spring in action. [S.n.].

Cita Chicago Style (17a ed.)

Walls, Craig, y Ryan Breidenbach. Spring in Action. Greenwich: [S.n.], 2005.

Cita MLA (9a ed.)

Walls, Craig, y Ryan Breidenbach. Spring in Action. [S.n.], 2005.