Schuller, R. (1985). The be happy attitudes: Eight postive attitudes that can transform your life. Word books.
Lua i Stíl Chicago (17ú heag.)Schuller, Robert. The Be Happy Attitudes: Eight Postive Attitudes That Can Transform Your Life. Texas: Word books, 1985.
Lua MLA (9ú heag.)Schuller, Robert. The Be Happy Attitudes: Eight Postive Attitudes That Can Transform Your Life. Word books, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.