Ryan, M. J. (1999). Attitudes of gratitude: How to give and receive joy every day of your life. Conari Press.
Citazione stile Chigago Style (17a edizione)Ryan, M. J. Attitudes of Gratitude: How to Give and Receive Joy Every Day of Your Life. Berkeley, Calif: Conari Press, 1999.
Citatione MLA (9a ed.)Ryan, M. J. Attitudes of Gratitude: How to Give and Receive Joy Every Day of Your Life. Conari Press, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.