* Riggs RD, Hamblen ML (1962) Soybean-cyst nematode host studies in the family Leguminosae. Report Series 110. Agricultural Experiment Station. University of Arkansas, Fayetteville (US), 18 pp.
------- Host range experiments.
* Riggs RD, Hamblen ML (1966) Further studies on the host range of the soybean-cyst. Bulletin of the Agricultural Experiment Station no. 718. University of Arkansas, Fayetteville (US), 19 pp.
------- Host range experiments.