Cita APA (7th ed.)

Walls, C., & Breidenbach, R. (2008). Spring in action (2a. ed.). Manning Publications Co.

Cita Chicago (17th ed.)

Walls, Craig, i Ryan Breidenbach. Spring in Action. 2a. ed. Greenwich: Manning Publications Co, 2008.

Cita MLA (9th ed.)

Walls, Craig, i Ryan Breidenbach. Spring in Action. 2a. ed. Manning Publications Co, 2008.