Gurova, Maria, and Clive Bonsall. “Lithic Studies: An Alternative Approach to Neolithization”. Bulgarian e-Journal of Archaeology | Българско е-Списание за Археология 4, no. 2 (December 30, 2014): 107-135. Accessed June 19, 2021. https://be-ja.org/index.php/journal/article/view/be-ja-4-2-2014-107-135.