Anatchkova, M. D., C. A. Redding, and J. S. Rossi. “Factors Associated With Smoking Cessation and Risk of Smoking Initiation in Bulgarian Youth”. Californian Journal of Health Promotion, Vol. 4, no. 2, June 2006, pp. 1-12, doi:10.32398/cjhp.v4i2.1929.