Greenberg, D. (2006). Calvin Coolidge. Times Book.
芝加哥风格引文Greenberg, David. Calvin Coolidge. Times Book, 2006.
MLA引文Greenberg, David. Calvin Coolidge. Times Book, 2006.
警告：这些引文格式不一定是100％准确.
APA引文
Greenberg, D. (2006). Calvin Coolidge. Times Book.
芝加哥风格引文Greenberg, David. Calvin Coolidge. Times Book, 2006.
MLA引文Greenberg, David. Calvin Coolidge. Times Book, 2006.