Zhu, Shu-Hong; Melcer, Ted; Sun, Jichao; Rosbrook, Bradley; Pierce, John P (May 2000). "Smoking cessation with and without assistance: A population-based analysis". American Journal of Preventive Medicine. 18 (4): 305–11. doi:10.1016/S0749-3797(00)00124-0. PMID10788733.
Zhu, Shu-Hong; Melcer, Ted; Sun, Jichao; Rosbrook, Bradley; Pierce, John P (May 2000). "Smoking cessation with and without assistance: A population-based analysis". American Journal of Preventive Medicine. 18 (4): 305–11. doi:10.1016/S0749-3797(00)00124-0. PMID10788733.