Palmer, R. R. (. R. (2007). A history of the modern world. Boston: McGraw-Hill.
Trích dẫn kiểu ChicagoPalmer, R. R. (Robert Roswell). A History of the Modern World. Boston: McGraw-Hill, 2007.
MLA引文Palmer, R. R. (Robert Roswell). A History of the Modern World. Boston: McGraw-Hill, 2007.
警告：这些引文格式不一定是100％准确.