For Pinguicula
Fischer et al. In Kadereit, J.W. 2004. The families and genera of vascular plants. VII. Flowering plants – Dicotyledons – Lamiales (except Acanthaceae including Avicenniaceae). Springer, Berlin. 478 pp.
Godfrey, R.K., and H.L. Stripling. 1961. A synopsis of Pinguicula (Lentibulariaceae) in the southeastern United States. American Midland Naturalist 66(2): 395-409.
Schnell, D.E. 1980a. Pinguicula caerulea Walt. forma leucantha: a new form. Castanea 45: 56-60.
Schnell, D.E. 2002b. Carnivorous plants of the United States and Canada. 2nd edition. Timber Press, Portland, OR. 468 pp.
Wood, C.E., and R.K. Godfrey. 1957. Pinguicula (Lentibulariaceae) in the southeastern United States. Rhodora 59: 217-230.
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