Author: Kānprachum thāng Wichākān Chœ̄ng Patibatkān Mahāwitthayālai Mahidon rư̄ang Krung Thēp-- Khadīsưksā Rō̜. Sō̜. 211: Thitthāng læ Khrư̄akhāi Ngānwičhai (1993 Bangkok, Thailand)