Ptelea im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Abgerufen am 11. Juni 2017.
doi.org
John D. Ambrose, Peter G. Kevan, Randy M. Gadawski: Hop tree (Ptelea trifoliata) in Canada: population and reproductive biology of a rare species. In: Canadian Journal of Botany. 63(11), 2011, S. 1928–1935, doi:10.1139/b85-272.
