The lost world of old Europe: the Danube Valley, 5000-3500 BC
by Bailey, Douglass W., (Douglass Whitfield), New York University, Institute for the Study of the Ancient World, Muzeul Național de Istorie a României, Anthony, David W., Chi, Jennifer, Muzeul Național de Arheologie si Istorie a Moldovei, Varnenski okrŭg (Bulgaria)., Okrŭzhen istoricheski muzeĭ