Ford, G. B. (1969). A degree of difference. Farrar, Straus & Giroux.
Lua i Stíl Chicago (17ú heag.)Ford, George Barry. A Degree of Difference. New York: Farrar, Straus & Giroux, 1969.
Lua MLA (8ú heag.)Ford, George Barry. A Degree of Difference. Farrar, Straus & Giroux, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.