^Mongkolsuk, Stang; Dean, F. M.; Houghton, L. E. Combretol from Combretum quadrangulare. Journal of the Chemical Society C: Organic. 1966: 125. doi:10.1039/J39660000125.
^Fahmi, Rizal; Sargent, Melvyn V.; Skelton, Brian W.; White, Allan H. 5-Hydroxy-3,3′,4′,5′,7-pentamethoxyflavone (combretol). Acta Crystallographica Section E Structure Reports Online. 2004-01-15, 60 (1): o86–o88. doi:10.1107/S1600536803027880.