Praag, B. M. S. v. Happiness quantified. Oxford University Press.
芝加哥风格引文Praag, Bernard M. S. van. Happiness Quantified. Oxford University Press.
MLA引文Praag, Bernard M. S. van. Happiness Quantified. Oxford University Press.
警告：这些引文格式不一定是100％准确.
APA引文