Ramsay, J., Wright, C., Thompson, R., Hull, D., & Morice, A. H. (2008). Assessment of antitussive efficacy of dextromethorphan in smoking related cough: Objective vs. subjective measures. Blackwell Science Inc.

Ramsay, James, Caroline Wright, Rachel Thompson, David Hull, ja Alyn H. Morice. Assessment of Antitussive Efficacy of Dextromethorphan in Smoking Related Cough: Objective Vs. Subjective Measures. Blackwell Science Inc, 2008.

Ramsay, James, et al. Assessment of Antitussive Efficacy of Dextromethorphan in Smoking Related Cough: Objective Vs. Subjective Measures. Blackwell Science Inc, 2008.