For Polemonium
Davidson, J.F. 1950. The genus Polemonium (Tournefort) L. Univ. California Publ. Bot. 23: 209-282.
Wilken. 2004. In Kubitzki, K., ed. 2004. The families and genera of vascular plants. VI. Flowering plants – Dicotyledons – Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer, Berlin. 489 pp.
Worley, A.C., H. Ghazvini, and D.W. Schemske. 2009. A phylogeny of the genus Polemonium based on amplified fragment length polymorphism (AFLP) markers. Systematic Bot. 34: 149-161.
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