Hubbard, L. R. (2007). Advanced Procedure and Axioms. Bridge.
Lua i Stíl Chicago (17ú heag.)Hubbard, L. Ron. Advanced Procedure and Axioms. Bridge, 2007.
Lua MLA (8ú heag.)Hubbard, L. Ron. Advanced Procedure and Axioms. Bridge, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.