Popescu, I., & Altmann, G. (2009). Word frequency studies. Mouton de Gruyter.
芝加哥风格引文Popescu, Ioan-Ioviț, 与 Gabriel Altmann. Word Frequency Studies. Berlin ; New York: Mouton de Gruyter, 2009.
MLA引文Popescu, Ioan-Ioviț, 与 Gabriel Altmann. Word Frequency Studies. Mouton de Gruyter, 2009.
警告：这些引文格式不一定是100％准确.