Fredrickson, B. (2009). Positivity. Oneworld Publications.
Chicagoスタイル(17版)引用形式Fredrickson, Barbara. Positivity. London: Oneworld Publications, 2009.
MLA(9版)引用形式Fredrickson, Barbara. Positivity. Oneworld Publications, 2009.
警告: この引用は必ずしも正確ではありません.
APA(7版)引用形式