1. Onslow (1925).The Anthocyanin Pigments of Plants. 2nd ed. Numerous references to Willstätter’s articles.
2. Scott-Moncrieff (1930).“The magenta flower pigment ofAntirrhinum majus.” Biochem. Journ. XXIV, No. 3.
3. Wheldale (Onslow) (1909).Royal Soc. Evolution Reports.
4. Buxtoh andDarbishire (1929). “On the behaviour of anthocyanins at varying H ion concentrations.”Journ. Gen. XXI, No. 1.
5. Bradley, Robinson andSchwarzenbach (1930).Journ. Chem. Soc. CVII, 810.