Walls, C. (2019). Spring in action (Fifth edition.). Manning.
Lua i Stíl Chicago (17ú heag.)Walls, Craig. Spring in Action. Fifth edition. Shelter Island: Manning, 2019.
Lua MLA (8ú heag.)Walls, Craig. Spring in Action. Fifth edition. Manning, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.