Retrieved May 11, 2012.
Sabia, Joseph J. (May 31, 2004). "Why Richard Nixon Deserves to Be Remembered Along with Brown". History News Network. Retrieved May 11, 2012.
"Kennedy Wins 1960 Presidential Election". 1960 Year In Review. United Press International. Retrieved July 17, 2011.
"1968 Presidential Election". 1968 Year in Review. United Press International. Retrieved July 16, 2011.
"Nixon Becomes President". 1969 Year in Review. United Press International. Retrieved July 16, 2011.
"Postage rates for periodicals: A narrative history" (PDF). United States Postal Service. Archived from the original (PDF) on July 30, 2013. Retrieved August 6, 2011.
Office of the Federal Register (1999). "New Actions To Prevent Illnesses And Accidents". Public Papers of the Presidents of the United States, Richard Nixon, 1971. National Archives and Records Service. General Services Administration. ISBN 978-0-16-058863-1.
"Statement on Signing the National Sickle Cell Anemia Control Act". The American Presidency Project. University of California, Santa Barbara. May 16, 1972.
National Heart, Lung, and Blood Institute (September 2002). "Sickle Cell Research for Treatment and Cure" (PDF). National Institutes of Health. 02-5214. Archived from the original (PDF) on January 31, 2012.
Wailoo, Keith (2001). 