Fredrickson, B. (2009). Positivity. Oneworld Publications.
芝加哥风格引文Fredrickson, Barbara. Positivity. London: Oneworld Publications, 2009.
MLA引文Fredrickson, Barbara. Positivity. Oneworld Publications, 2009.
警告：这些引文格式不一定是100％准确.
APA引文