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APA Citation
Hyland, A., Laux, F. L., Higbee, C., Hastings, G., Ross, H., Chaloupka, F. J., Fong, G. T., & Cummings, K. M. (n.d.). cigarette purchase patterns in four countries and the relationship with cessation: findings from the International Tobacco Control (ITC) Four Country Survey. Tobacco control, 15, iii59–iii64. http://access.bl.uk/ark:/81055/vdc_100137792742.0x000021