Documents On Vietcong and N.Vietnamese Aggression Against Cambodia (1970)
http://www.vietnam.ttu.edu/star/images/243/2430201010a.pdf
Cambodia, Ministère de l'information, The North Vietnamese and Vietcong Aggression against the Khmer Republic (1970-1974). Phnom Penh: Ministry of Information, Khmer Republic, 1974. 72 pp.
http://www.clemson.edu/caah/history/facultypages/EdMoise/cambodia.html