1. Dermatology Expert Group 2009 Therapeutic guidelines: dermatology. Version 3. Therapeutic Guidelines Limited, Melbourne
2. Low concentration dithranol and coal tar (Psorin) in psoriasis: a comparison with alcoholic coal tar extract and allantoin (Alphosyl);Harrington;British Journal of Clinical Practice,1989
3. Lichen planus;Katta;American Family Physician,2000
4. Atlas of common skin diseases in Australia;Marks,1999
5. Mason A R, Mason J, Cork M et al 2009 Topical treatments for chronic plaque psoriasis. Cochrane Database of Systematic Reviews, Issue 2. Art. No.: CD005028. DOI: 10.1002/14651858.CD005028.pub2