Title: Rāingān wičhai rư̄ang samatthaphāp nai kānchai Phāsā Thai khan tāng tāng khō̜ng Khonthai, khrōngkān pī thī 1
Description: Levels of proficiency in the Thai language attained by university students; study undertaken at Chulalongkorn University, 1975-1977.