Of the banthityotthan. (2533 (1990)). The punctuation and other marks. Criteria for a space. Basis to learn abbreviations. Type the 5th amendment. Bangkok: Royal banthityotthan.
Royal Academy. (2533). Guidelines for the use of punctuation marks and other punctuation rules. The acronym guidelines. 5th edition, as amended. London: Royal Academy.
The Royal Academy (2533). Rules for punctuation marks and other criteria before rules learning obstacles hue, abbreviations. Type II 5 amended. Bangkok: the Royal Academy.