6[1]Richard A. Watson. Presidential vetoes and public policy[M]. University Press of Kansas. 1993.
7[2](前苏)科瓦略夫.古代罗马史[M].王以铸译.北京:三联出版社,1957.
8[4]Robert J. Spitzer. The President's Veto Power[A] . in Thomas E. Cronin(ed),Inventing The American Presidency[C] . University Press of Kansas, 1989.