Pittler MH, Ernst E (2003). Pittler, Max H (ed.). "Kava extract for treating anxiety". Cochrane Database of Systematic Reviews (Online) (1): CD003383. doi:10.1002/14651858.CD003383. PMID12535473.
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Pittler MH, Ernst E (2003). Pittler, Max H (ed.). "Kava extract for treating anxiety". Cochrane Database of Systematic Reviews (Online) (1): CD003383. doi:10.1002/14651858.CD003383. PMID12535473.