Diem, Bui and Chanoff, David In the Jaws of History Bloomington: Indiana University Press, 1999. ISBN0-253-21301-0; McNeill, Ian and Ekins, Ashley On the Offensive: The Australian Army in the Vietnam War, January 1967-June 1968 Crows Nest, Australia: Allen & Unwin, 2003. ISBN1-86373-304-3; "South Viet Nam: Thieu on Top"Time July 7, 1967; Apple, Jr., R. W. "Ky's Political Plans", New York Times May 10, 1967.
For three decades, historians believed that the bombing raids had been few, irregular, and limited to border areas until the implementation of Operation Menu by the United States Air Force between March 1969 and May 1970. See: Chandler, David P. The Tragedy of Cambodian History: Politics, War, and Revolution Since 1945 Reprint ed. New Haven, Conn.: Yale University Press, 1993. ISBN0-300-05752-0 However, in 2000, newly declassified American military documents revealed that the secret bombing of Cambodia had been extensive, frequent, and heavy since at least 1965 and had ranged over nearly the entire country. See: Owen, Taylor and Kiernan, Bob. "Bombs Over Cambodia"The Walrus October 2006; Young, Marilyn Blatt and Buzzanco, Robert A Companion to the Vietnam War Indianapolis: Wiley-Blackwell, 2006. ISBN1-4051-4983-3; Nalty, Bernard C. Air War Over South Vietnam, 1968-1975 Washington, D.C.: Department of the Air Force, 2001. ISBN0-16-050914-9
