Coates, R. H. (1967). Operation alphabet. Noble and Noble.
Lua i Stíl Chicago (17ú heag.)Coates, Robert H. Operation Alphabet. [New York]: Noble and Noble, 1967.
Lua MLA (8ú heag.)Coates, Robert H. Operation Alphabet. Noble and Noble, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.