Walls, C. (2011). Spring in action (3rd ed.). Manning.
Lua i Stíl Chicago (17ú heag.)Walls, Craig. Spring in Action. 3rd ed. Shelter Island: Manning, 2011.
Lua MLA (8ú heag.)Walls, Craig. Spring in Action. 3rd ed. Manning, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.