1. General Tests and Assays. “The United States Pharmacopoeia XXII. The National Formulary XVII.” Supplement 5. The United States Pharmacopeial Convention, Inc., Mack Publishing Company, Rockville, Maryland, Easton, Pennsylvania 1991; 2711–2715
2. Hanson W. A. Handbook of Dissolution Testing, 2nd Edition. Aster Publishing Corporation, Eugene, Oregon 1991; 59–66
3. In vitro skin permeation techniques
4. Hanson W. A. Handbook of Dissolution Testing, 2nd Edition. Aster Publishing Corporation, Eugene, Oregon 1991; 56