Aeny, Titik Nur and Riggs, Robert D. (1993) Susceptibility of Soybean Introductions to Races 1, 2, 3, and 4 of Heterodera glycines. Journal of Nematology, 25 (1). pp. 34-37.

Salam, Abdul Kadir and Corey, R. B. (1993) The Soil Potassium-Supplying Capacities Measured by Resin Methods. Indonesian Journal of Tropical Agriculture, 4 (2). pp. 47-52. ISSN 0852-5927

Triyono, Sugeng (1993) Performance of a Constructed Wetland in Swine Wastewater Treatment. Mississippi State University. (Unpublished)