Tjia, J., Briesacher, B. A., Soumerai, S. B., Pierre-Jacques, M., Zhang, F., Ross-Degnan, D., & Gurwitz, J. H. (2008). Medicare Beneficiaries and Free Prescription Drug Samples: A National Survey. Springer-Verlag.

Tjia, Jennifer, Becky A. Briesacher, Stephen B. Soumerai, Marsha Pierre-Jacques, Fang Zhang, Dennis Ross-Degnan, and Jerry H. Gurwitz. Medicare Beneficiaries and Free Prescription Drug Samples: A National Survey. Springer-Verlag, 2008.

Tjia, Jennifer, et al. Medicare Beneficiaries and Free Prescription Drug Samples: A National Survey. Springer-Verlag, 2008.