Silverberg, Nanette B.; Lim, Joseph K.; Paller, Amy S.; Mancini, Anthony J. (2000). "Squaric acid immunotherapy for warts in children". Journal of the American Academy of Dermatology. 42 (5): 803–808. doi:10.1067/mjd.2000.103631. PMID10775858.
Silverberg, Nanette B.; Lim, Joseph K.; Paller, Amy S.; Mancini, Anthony J. (2000). "Squaric acid immunotherapy for warts in children". Journal of the American Academy of Dermatology. 42 (5): 803–808. doi:10.1067/mjd.2000.103631. PMID10775858.
Holzer, A. M.; Kaplan, L. L.; Levis, W. R. (2006). "Haptens as drugs: contact allergens are powerful topical immunomodulators". J. Drugs Dermatol. 5 (5): 410–416. PMID16703776.