Robin Walker. (2006). Oxford English for careers tourism 1. NY. Oxford.
Trích dẫn kiểu ChicagoRobin Walker. Oxford English for Careers Tourism 1. NY. Oxford, 2006.
MLA引文Robin Walker. Oxford English for Careers Tourism 1. NY. Oxford, 2006.
警告：这些引文格式不一定是100％准确.