Leonard M. Schuman (1977), "Patterns of Smoking Behavior", in Murray E. Jarvik; Joseph W. Cullen; Ellen R. Gritz; Thomas M. Vogt; Louis Jolyon West (eds.), Research on Smoking Behavior(PDF), NIDA Research Monograph, vol. 17, pp. 36–65, archived from the original(PDF) on 23 July 2015, retrieved 21 October 2015
Lynn T. Kozlowski (1983), "Physical Indicators of Actual Tar and Nicotine Yields of Cigarettes", in John Grabowski; Catherine S. Bell (eds.), Measurement in the Analysis and Treatment of Smoking Behavior(PDF), NIDA Research Monograph, vol. 48, U.S. Dept. of Health and Human Services, pp. 50–61, PMID6443144, archived from the original(PDF) on 17 October 2016, retrieved 29 March 2016
Lynn T. Kozlowski (1983), "Physical Indicators of Actual Tar and Nicotine Yields of Cigarettes", in John Grabowski; Catherine S. Bell (eds.), Measurement in the Analysis and Treatment of Smoking Behavior(PDF), NIDA Research Monograph, vol. 48, U.S. Dept. of Health and Human Services, pp. 50–61, PMID6443144, archived from the original(PDF) on 17 October 2016, retrieved 29 March 2016
Leonard M. Schuman (1977), "Patterns of Smoking Behavior", in Murray E. Jarvik; Joseph W. Cullen; Ellen R. Gritz; Thomas M. Vogt; Louis Jolyon West (eds.), Research on Smoking Behavior(PDF), NIDA Research Monograph, vol. 17, pp. 36–65, archived from the original(PDF) on 23 July 2015, retrieved 21 October 2015
Lynn T. Kozlowski (1983), "Physical Indicators of Actual Tar and Nicotine Yields of Cigarettes", in John Grabowski; Catherine S. Bell (eds.), Measurement in the Analysis and Treatment of Smoking Behavior(PDF), NIDA Research Monograph, vol. 48, U.S. Dept. of Health and Human Services, pp. 50–61, PMID6443144, archived from the original(PDF) on 17 October 2016, retrieved 29 March 2016