Nemchenko, M.V., and V.P. Bessonova. “The States Valuation of Plants of Catalpa Bignonioides Walt. and Catalpa Speciosa Ward. In the Condition Growth in a Wayside Afforestation”. Plant Introduction 42 (June 1, 2009): 85-90. Accessed October 19, 2026. http://www.plantintroduction.org/index.php/pi/article/view/667.