^Dickinson, William B.; Mercer Cross, Barry Polsky. Watergate: chronology of a crisis1. D. C.: Congressional Quarterly Inc. 1973: 8 133 140 180 188 [2013-03-28]. ISBN 0-87187-059-2. OCLC 20974031. (原始内容存档于2009-09-24).引文使用过时参数coauthors (帮助)本书共有两卷,共用同一个ISBN编码和国会图书馆编码E859 .C62 1973
^ 2.02.12.2The Smoking Gun Tape. Watergate.info website. 1972-06-23 [2013-03-28]. (原始内容(Transcript of the recording of a meeting between President Nixon and H. R. Haldeman)存档于2012-05-01).
^证据其实很简单:根据1972年6月23日的录音,总统指示中央情报局(Central Intelligence Agency,简称CIA)局长说:“……中央情报局应当给联邦调查局打个电话,就白宫方面希望,为了国家利益,不要进一步深入调查水门案了”。这一录音成为了总统妨碍司法的“确凿证据”(smoking gun)White, Theodore Harold. Breach of Faith: The Fall of Richard Nixon. New York: Atheneum Publishers. 1975: 7 [2020-09-12]. ISBN 0-689-10658-0. (原始内容存档于2009-04-27).
^Stanley I. Kutler. Abuse of Power: The New Nixon Tapes. : 69.
^White (1975), Breach of Faith, p. 29. "And the most punishing blow of all was to come in late afternoon when the President received, in his Oval Office, the Congressional leaders of his party -– Barry Goldwater, Hugh Scott and John Jacob Rhodes. The accounts of all three coincide… Goldwater averred that there were not more than fifteen votes left in his support in the Senate…."
^"Soon Alexander Haig and James St. Clair learned of the existence of this tape and they were convinced that it would guarantee Nixon's impeachment in the House of Representatives and conviction in the Senate."Dash, Samuel. Chief Counsel: Inside the Ervin Committee – The Untold Story of Watergate. New York: Random House. 1976: 259–260 [2013-03-28]. ISBN 0-394-40853-5. (原始内容存档于2008-10-10).