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Harborne, J.B. (). „Plant polyphenols: 5. Occurrence of azalein and related pigments in flowers of Plumbago and Rhododendro species”. Archives of Biochemistry and Biophysics. 96: 171–8. doi:10.1016/0003-9861(62)90467-8. PMID13904580.
Sasaki, T; Mikami, M (). „Studies on the Components of Pecan (Carya Pecan Engl. & Graebn). I. On the Flavon Isolated from the Bark of Pecan”. Yakugaku Zasshi. 83: 897–900. doi:10.1248/yakushi1947.83.9_897. PMID14085492.
Harborne, J.B. (). „Plant polyphenols: 5. Occurrence of azalein and related pigments in flowers of Plumbago and Rhododendro species”. Archives of Biochemistry and Biophysics. 96: 171–8. doi:10.1016/0003-9861(62)90467-8. PMID13904580.
Sasaki, T; Mikami, M (). „Studies on the Components of Pecan (Carya Pecan Engl. & Graebn). I. On the Flavon Isolated from the Bark of Pecan”. Yakugaku Zasshi. 83: 897–900. doi:10.1248/yakushi1947.83.9_897. PMID14085492.