Fredrickson, B. (2009). Positivity (First edition.). Three Rivers Press.
Chicagoスタイル(17版)引用形式Fredrickson, Barbara. Positivity. First edition. New York: Three Rivers Press, 2009.
MLA(9版)引用形式Fredrickson, Barbara. Positivity. First edition. Three Rivers Press, 2009.
警告: この引用は必ずしも正確ではありません.