Collins, P. (2009). Modals and quasi-modals in English. Rodopi.
芝加哥风格引文Collins, Peter. Modals and Quasi-modals in English. Amsterdam ; New York, NY: Rodopi, 2009.
MLA引文Collins, Peter. Modals and Quasi-modals in English. Rodopi, 2009.
警告：这些引文格式不一定是100％准确.