Jack Sullivan (1998). "Anthocyanin". Carnivorous Plant Newsletter (CPN) September 1998. Archived from the original on 1 November 2009. Retrieved 6 October 2009.
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Jack Sullivan (1998). "Anthocyanin". Carnivorous Plant Newsletter (CPN) September 1998. Archived from the original on 1 November 2009. Retrieved 6 October 2009.