Neill, H. B. (1963). The art of contrary thinking: It pays to be contrary (6th and enl. ed.). Caxton Printers.
Lua i Stíl Chicago (17ú heag.)Neill, Humphrey B. The Art of Contrary Thinking: It Pays to Be Contrary. 6th and enl. ed. Caldwell, Idaho: Caxton Printers, 1963.
Lua MLA (9ú heag.)Neill, Humphrey B. The Art of Contrary Thinking: It Pays to Be Contrary. 6th and enl. ed. Caxton Printers, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.