Change Over Time. University of Pennsylvania Press.
芝加哥风格引文Change Over Time. University of Pennsylvania Press.
MLA引文Change Over Time. University of Pennsylvania Press.
警告：这些引文格式不一定是100％准确.
APA引文
Change Over Time. University of Pennsylvania Press.
芝加哥风格引文Change Over Time. University of Pennsylvania Press.
MLA引文Change Over Time. University of Pennsylvania Press.