APA (7e ed.) Bronvermelding

Schuller, R. (1985). The be happy attitudes: Eight postive attitudes that can transform your life. Word books.

Chicago (17e ed.) Bronvermelding

Schuller, Robert. The Be Happy Attitudes: Eight Postive Attitudes That Can Transform Your Life. Texas: Word books, 1985.

MLA (9e ed.) Bronvermelding

Schuller, Robert. The Be Happy Attitudes: Eight Postive Attitudes That Can Transform Your Life. Word books, 1985.