Songrak Tengratanaprasert และ Prayart Tengratanaprasert; Preecha Taengpiw; Suraporn Chaiaree; Sukawem Sawaengpon; Suriya Chansaengsri; Chanya Pannengpet; Chaiuyong Samrantin; Sommai Nilapanthu. (1993) Ubon Ratchathani 60-35 ,a Bi x Polyvoltine Silkworm Hybrid. <i>Thai Agricultural Research Journal</i>, <i>11</i>(3), 127-132.Songrak Tengratanaprasert และ Prayart Tengratanaprasert; Preecha Taengpiw; Suraporn Chaiaree; Sukawem Sawaengpon; Suriya Chansaengsri; Chanya Pannengpet; Chaiuyong Samrantin; Sommai Nilapanthu. "Ubon Ratchathani 60-35 ,a Bi x Polyvoltine Silkworm Hybrid". Thai Agricultural Research Journal 11 (1993):127-132.Songrak Tengratanaprasert และ Prayart Tengratanaprasert; Preecha Taengpiw; Suraporn Chaiaree; Sukawem Sawaengpon; Suriya Chansaengsri; Chanya Pannengpet; Chaiuyong Samrantin; Sommai Nilapanthu. Ubon Ratchathani 60-35 ,a Bi x Polyvoltine Silkworm Hybrid. Department of Agriculture:ม.ป.ท. 1993.