Citazione Stile APA (7a Edizione)

Walls, C. (2011). Spring in action (3rd ed.). Manning.

Citazione stile Chigago Style (17a edizione)

Walls, Craig. Spring in Action. 3rd ed. Shelter Island: Manning, 2011.

Citatione MLA (8a ed.)

Walls, Craig. Spring in Action. 3rd ed. Manning, 2011.