ISO 11940-2:2007 Information and documentation — Transliteration of Thai characters into Latin characters. Part 2: Simplified transcription of Thai language.
Vijarivudh R.: The Romanization of Siamese Words by His Majesty the King. In: Journal of the Siam Society 9 (1912), 4. Online (PDF, letzter Zugriff am 24. Oktober 2021; 1,1 MB).