These are the source references for Episode 4 of Rachel Maddow's Bag Man podcast, a transcript of which you can find here. Subscribe through your preferred podcasting service.
Books:
Witcover, Jules. “Very Strange Bedfellows: The Short and Unhappy Marriage of Richard Nixon and Spiro Agnew”, PublicAffairs, 2008
Cohen, Richard and Witcover, Jules. “A Heartbeat Away”, Viking Press, 1974
Agnew, Spiro T. “Go Quietly … Or Else”, William Morrow, 1980
Nixon, Richard. “RN: The Memoirs of Richard Nixon”, Simon & Schuster, 1990
London, Martin. “The Client Decides: A Litigator's Life: Jackie Onassis, Vice President Spiro Agnew, Donald Trump, Roy Cohn, and More”, Eastlake Press, 2017
Coffey, Justin. “Spiro Agnew and The Rise of the Republican Right”, Praeger, 2015
Ehrlichman, John. “Witness to Power: The Nixon Years”, Simon & Schuster Publishing, 1982
Richardson, Elliot. “The Creative Balance: Government, Politics, and The Individual in America’s Third Century.” Holt, Rinehart and Winston. 1976
Articles:
“Clement Stone Dies at 100; Built Empire on Optimism”, The New York Times (September 5, 2002)
“Sinatra Reported Working Hard Among Friends to Raise Money To Aid Agnew”, The New York Times (December 4, 1973)
“Nixon Visits Baltimore, Hails Beall”, The Baltimore Sun Newspaper (October 25, 1970)
“Beall Feted By Agnew At Republican Dinner”, The Evening Sun Newspaper (October 21, 1970)
Archival Material:
NBC Nightly News (September 27, 1973)
Agnew Legal Defense Fund Press Release, Spiro T. Agnew papers, Special Collections, University of Maryland Libraries
April 25, 1973. Richard Nixon White House Tapes, Richard Nixon Presidential Library and Museum, Yorba Linda, CA
NBC News Archives (April 29, 1975)
April 10, 1973, H. R. Haldeman Diaries Collection. Richard Nixon Presidential Library and Museum, Yorba Linda, CA
April 13, 1973. Richard Nixon White House Tapes, Richard Nixon Presidential Library and Museum, Yorba Linda, CA
June 14, 1973. Richard Nixon White House Tapes, Richard Nixon Presidential Library and Museum, Yorba Linda, CA
Vice President Spiro T. Agnew campaigns with Rep. Glenn Beall, August 5, 1970, Richard Nixon Presidential Library and Museum, Yorba Linda, CA
April 30, 1973, H. R. Haldeman Diaries Collection. Richard Nixon Presidential Library and Museum, Yorba Linda, CA
NBC Nightly News (May 4, 1973)
June 19, 1973. Richard Nixon White House Tapes, Richard Nixon Presidential Library and Museum, Yorba Linda, CA
June 20, 1973. Richard Nixon White House Tapes, Richard Nixon Presidential Library and Museum, Yorba Linda, CA
U.S. Attorney George Beall, Memo to File, July 25, 1973. Beall Collection / Lewis J. Ort Library, Frostburg State University
Vice President Spiro T. Agnew Notes & Daily Calendars, 1973. Spiro T. Agnew papers, Special Collections, University of Maryland Libraries
“Meet The Press”, NBC News (May 18, 1980)