Vassilev Z.P., Kabadi S., Villa R. Safety and efficacy of over-the-counter cough and cold medicines for use in children (англ.) // Expert opinion on drug safety : journal. — 2010. — March (vol. 9, no. 2). — P. 233—242. — doi:10.1517/14740330903496410. — PMID20001764.
Vassilev Z.P., Kabadi S., Villa R. Safety and efficacy of over-the-counter cough and cold medicines for use in children (англ.) // Expert opinion on drug safety : journal. — 2010. — March (vol. 9, no. 2). — P. 233—242. — doi:10.1517/14740330903496410. — PMID20001764.