Marcus, J. (1975). Young Billy: James Marcus. [Star].
Lua i Stíl Chicago (17ú heag.)Marcus, James. Young Billy: James Marcus. [New York]: [Star], 1975.
Lua MLA (8ú heag.)Marcus, James. Young Billy: James Marcus. [Star], 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.