ロバート・ベルデラ
“Kansas City Sicko Kept Detailed Diary, Photos of Sex Torture, Bondage and Murder”. New York Daily News (New York City: Tronc). http://www.nydailynews.com/news/crime/kansas-city-sex-slayer-detailed-diary-torture-murder-article-1.2723454 2017年5月19日閲覧。
↑ Newton, Michael (2002). The Encyclopedia of Kidnappings. Facts On File Crime Library. New York: Facts On File. p. 25. ISBN 978-0-8160-4486-3. LCCN 2001-40170. OCLC 593209888. OL 9741936M. https://books.google.com/books?id=EZjlE4-1GSIC&pg=PA25
↑ Federal Reserve Bank of Minneapolis Community Development Project. "Consumer Price Index (estimate) 1800–" (英語). Federal Reserve Bank of Minneapolis.