Ferguson, D. (1998). The great commandment principle. Tyndale.
Lua i Stíl Chicago (17ú heag.)Ferguson, David. The Great Commandment Principle. Wheaton: Tyndale, 1998.
Lua MLA (9ú heag.)Ferguson, David. The Great Commandment Principle. Tyndale, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.