Allen, L. V., Popovich, N. G., & Ansel, H. C. (2011). Ansel's pharmaceutical dosage forms and drug delivery systems (9th ed.). Wolters Kluwer Health/Lippincott Williams & Wilkins.

Allen, Loyd V., Nicholas G. Popovich, and Howard C. Ansel. Ansel's Pharmaceutical Dosage Forms and Drug Delivery Systems. 9th ed. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins, 2011.

Allen, Loyd V., et al. Ansel's Pharmaceutical Dosage Forms and Drug Delivery Systems. 9th ed. Wolters Kluwer Health/Lippincott Williams & Wilkins, 2011.