Ansel, H. C., Popovich, N. G., & Allen, L. V. (1995). Pharmaceutical Dosage Forms and Drug Delivery Systems (6th ed.). B.I. Waverly Pvt Ltd.

Ansel, Howard C., Nicholas G. Popovich, and Loyd V. Allen. Pharmaceutical Dosage Forms and Drug Delivery Systems. 6th ed. New Delhi: B.I. Waverly Pvt Ltd, 1995.

Ansel, Howard C., et al. Pharmaceutical Dosage Forms and Drug Delivery Systems. 6th ed. B.I. Waverly Pvt Ltd, 1995.