Crow, W. T. “Spiral Nematode Helicotylenchus Spp. (Nematoda: Tylenchida: Hoplolaimidae): EENY544/IN973, Rev. 7/2017”. EDIS, vol. 2017, no. 5, Oct. 2017, p. 4, doi:10.32473/edis-in973-2017.