SCHULLER ROBERT H. (1991). BE HAPPY ATTITUDES: 8 POSITIVE ATTITUDES THAT CAN TRANSFORM YOUR LIFE. BANTAM BOOKS.
Citazione stile Chigago Style (17a edizione)SCHULLER ROBERT H. BE HAPPY ATTITUDES: 8 POSITIVE ATTITUDES THAT CAN TRANSFORM YOUR LIFE. NEW YORK: BANTAM BOOKS, 1991.
Citatione MLA (9a ed.)SCHULLER ROBERT H. BE HAPPY ATTITUDES: 8 POSITIVE ATTITUDES THAT CAN TRANSFORM YOUR LIFE. BANTAM BOOKS, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.