Official news reporting Prince <a href="https://en.wikipedia.org/wiki/Damrong_Rajanubhab" class="extiw" title="w:Damrong Rajanubhab">Damrong Rajanubhab</a>'s expedition to Singapore, 18 February 109 Rattanakosin Era (2433 Buddhist Era, 1891 Common Era)
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1891-02-22
"<a rel="nofollow" class="external text" href="http://www.ratchakitcha.soc.go.th/DATA/PDF/2433/047/425.PDF">กรมหมื่นดำรงราชานุภาพถวายบังคมลาไปเมืองสิงคโปร์</a>". (๒๔๓๓, ๒๒ กุมภาพันธ์). <i>ราชกิจจานุเบกษา</i>. เล่ม ๗, ตอน ๔๗. หน้า ๔๒๕.