Hull C, McKeough M, Sebastian K, Kriesel J, Spruance S (March 2009). "Valacyclovir and topical clobetasol gel for the episodic treatment of herpes labialis: a patient-initiated, double-blind, placebo-controlled pilot trial". Journal of the European Academy of Dermatology and Venereology. 23 (3): 263–7. doi:10.1111/j.1468-3083.2008.03047.x. PMID19143902. S2CID205588376.
Hull C, McKeough M, Sebastian K, Kriesel J, Spruance S (March 2009). "Valacyclovir and topical clobetasol gel for the episodic treatment of herpes labialis: a patient-initiated, double-blind, placebo-controlled pilot trial". Journal of the European Academy of Dermatology and Venereology. 23 (3): 263–7. doi:10.1111/j.1468-3083.2008.03047.x. PMID19143902. S2CID205588376.
Hull C, McKeough M, Sebastian K, Kriesel J, Spruance S (March 2009). "Valacyclovir and topical clobetasol gel for the episodic treatment of herpes labialis: a patient-initiated, double-blind, placebo-controlled pilot trial". Journal of the European Academy of Dermatology and Venereology. 23 (3): 263–7. doi:10.1111/j.1468-3083.2008.03047.x. PMID19143902. S2CID205588376.