Kuzmina, Elena Efimovna, (2008). The Prehistory of the Silk Road, Victor H. Mair (ed.), University of Pennsylvania Press, Philadelphia, p. 78: "...This culture appeared in the first half of the second millennium B.C., developing out of the local Kelteminar Culture (Gulyamov et al. 1966)..."
Grigoriev, Stanislav, (2016). Metallurgical Production in Northern Eurasia in the Bronze Age, Archaeopress Publishing Ltd., p. 664: "...With intensification of aridization in the second half of the 3rd [millennium] BC considerable qualitative changes begun here. The Kelteminar culture is succeeded by a series of cultures of the Early Bronze Age. It is the Suyargan culture on the lower Amu-Darya River...formed on the basis of the late Kelteminar under an influence of the southern impulses from North-Eastern Iran..."
