Everitt, David. Human Monsters. New York: Contemporary Books, 1993.
Kelleher, Michael D. Flash Point: The American Mass Murder. Westport Connecticut: Praeger, 1997.
Levin, Jack and James Alan Fox. Mass Murder: America's Growing Menace. New York: Plenum, 1985.
Lunde, Donald T. Murder and Madness. San Francisco: CA: San Francisco Book Co. 1976.
Yamanaka, Sharon. "Serial Murders in Santa Cruz County," 8/12-2003.
Santa Cruz County: A Century. Santa Cruz Sentinel Publishers Co., 1999.
Articles from the Santa Cruz Sentinel, Oct 23, 1970-Dec 1971.
"Indictment of Ohta Suspect Sought," Green Sheet and Cabrillo Times, Oct 29, 1970.
Thanks to Kristen Vaughan Wilson from the Santa Cruz Public Library and to Jana Marcus for their assistance with research.