Weaver, W. (1998). Hard ball: A Billy Baggs novel. Harper Trophy.
Lua i Stíl Chicago (17ú heag.)Weaver, Will. Hard Ball: A Billy Baggs Novel. New York: Harper Trophy, 1998.
Lua MLA (9ú heag.)Weaver, Will. Hard Ball: A Billy Baggs Novel. Harper Trophy, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.