Spring 2011, p. 287. Spring, Katherine (2011). "'To Sustain Illusion is All That is Necessary': The Authenticity of Song Performance in Early American Sound Cinema". Film History. 23 (3). Indiana University Press: 285. doi:10.2979/filmhistory.23.3.285. ISSN0892-2160. S2CID142022287.
"Harry Alderman Services Wednesday". Colorado Springs Gazette-Telegraph. September 29, 1966. p. 6. Retrieved August 25, 2014 – via Newspapers.com.
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Spring 2011, p. 287. Spring, Katherine (2011). "'To Sustain Illusion is All That is Necessary': The Authenticity of Song Performance in Early American Sound Cinema". Film History. 23 (3). Indiana University Press: 285. doi:10.2979/filmhistory.23.3.285. ISSN0892-2160. S2CID142022287.
Spring 2011, p. 287. Spring, Katherine (2011). "'To Sustain Illusion is All That is Necessary': The Authenticity of Song Performance in Early American Sound Cinema". Film History. 23 (3). Indiana University Press: 285. doi:10.2979/filmhistory.23.3.285. ISSN0892-2160. S2CID142022287.