Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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