Aristizábal, L.F. and Buss, E. 2016. Bluegrass Billbug Sphenophorus parvulus Gyllenhal (Insecta: Coleoptera: Curculionidae: Dryophthorinae): EENY 652/IN1133, 4/2016. EDIS. 2016, 4 (Jun. 2016), 6. DOI:https://doi.org/10.32473/edis-in1133-2016.