Godfrey, D. A., Peplinski, L. S., Stewart, J. A., & Stewart, W. C. (2009). A comfort comparison of travoprost BAK-free 0.004% versus latanoprost 0.005% in patients with primary open-angle glaucoma or ocular hypertension. Dove Medical Press.

Godfrey, David A., Lee S. Peplinski, Jeanette A. Stewart, and William C. Stewart. A Comfort Comparison of Travoprost BAK-free 0.004% Versus Latanoprost 0.005% in Patients With Primary Open-angle Glaucoma or Ocular Hypertension. Dove Medical Press, 2009.

Godfrey, David A., Lee S. Peplinski, Jeanette A. Stewart, and William C. Stewart. A Comfort Comparison of Travoprost BAK-free 0.004% Versus Latanoprost 0.005% in Patients With Primary Open-angle Glaucoma or Ocular Hypertension. Dove Medical Press, 2009.