Schuller, R. (1985). The be happy attitudes: Eight postive attitudes that can transform your life. Word books.
Style de citation Chicago (17e éd.)Schuller, Robert. The Be Happy Attitudes: Eight Postive Attitudes That Can Transform Your Life. Texas: Word books, 1985.
Style de citation MLA (9e éd.)Schuller, Robert. The Be Happy Attitudes: Eight Postive Attitudes That Can Transform Your Life. Word books, 1985.
Attention : ces citations peuvent ne pas être correctes à 100%.