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"ประกาศใช้ทุ่มโมงยาม", Royal Gazette, No. 17(PDF), 29 July 1901, p. 206, archived from the original(PDF) on 9 June 2012, retrieved 8 March 2017. (in Thai)
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This article incorporates text from a publication now in the public domain: Cabrol, Fernand (1911). "Matins". In Herbermann, Charles (ed.). Catholic Encyclopedia. Vol. 10. New York: Robert Appleton Company.