U. S. National Archives and Records Administration (undated). "Senate Oral History Program," section "About the Interviewer: Donald A. Ritchie." Retrieved 2015-03-28.
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"Donald A. Ritchie" (2011). Almanac of the Unelected: Staff of the U.S. Congress. 23rd ed. Suzanne Struglinski and Lisa Friedman (eds.). Lanham, MD: Bernan Press. p. 29.
"Donald A. Ritchie" (2006) [contributor biography]. In Barry A. Lanman and Laura M. Wendling (eds.), Preparing the Next Generation of Oral Historians: An Anthology of Oral History Education. Lanham, MD: AltaMira Press. p. 480.
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Ritchie, Donald A. (August 2003). "Releasing Joe McCarthy." Organization of American Historians (OAH) Newsletter, vol. 31, no. 3. p. 1, 6. Retrieved 2015-03-28.
Wilson Center (2010). "Why a Congress and Not a Parliament" [posting about event on September 13, 2010], section "Donald A. Ritchie" [speaker biography]. Retrieved 2015-03-28.