FOSTER STEVEN[A]. (2002). FIELD GUIDE TO WESTERN MEDICINAL PLANTS AND HERBS (2ND ED.). HOUGHTON MIFFIN COMPANY.
Lua i Stíl Chicago (17ú heag.)FOSTER STEVEN[A]. FIELD GUIDE TO WESTERN MEDICINAL PLANTS AND HERBS. 2ND ED. BOSTAN: HOUGHTON MIFFIN COMPANY, 2002.
Lua MLA (9ú heag.)FOSTER STEVEN[A]. FIELD GUIDE TO WESTERN MEDICINAL PLANTS AND HERBS. 2ND ED. HOUGHTON MIFFIN COMPANY, 2002.
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