ebrary, Inc, & Watson, R. P. (2012). The Obama presidency: A preliminary assessment. State University of New York Press.
芝加哥风格引文ebrary, Inc, 与 Robert P. Watson. The Obama Presidency: A Preliminary Assessment. Albany: State University of New York Press, 2012.
MLA引文ebrary, Inc, 与 Robert P. Watson. The Obama Presidency: A Preliminary Assessment. State University of New York Press, 2012.
警告：这些引文格式不一定是100％准确.