(Encyclopedia of Poland), Kraków, Wydawnictwo Ryszard Kluszczyński, 1996, আইএসবিএন ৮৩-৮৬৩২৮-৬০-৬. Richard Holmes, "Voltaire's Grin", New York Review of Books
১৯৭৪)। "Three New Species of Tournefortia (Boraginaceae) from the Andes and Comments on the Manuscripts of E. P. Killip"। Bulletin of the Torrey Botanical