"ประกาศใช้ทุ่มโมงยาม"(PDF), Royal Gazette, no. 17, p. 206, 29 July 1901, archived from the original(PDF) on June 9, 2012, retrieved 2008-10-18. (in Thai)
"ประกาศใช้ทุ่มโมงยาม"(PDF), Royal Gazette, no. 17, p. 206, 29 July 1901, archived from the original(PDF) on June 9, 2012, retrieved 2008-10-18. (in Thai)