A proclamation on formal investiture of Queen Suthida, dated 4 May 2019, published in the Government Gazette of Thailand.
Thai Government
2019-05-04
"<a rel="nofollow" class="external text" href="http://www.ratchakitcha.soc.go.th/DATA/PDF/2562/B/014/T_0002.PDF">Proclamation on Investiture of Her Majesty Queen Suthida Phatcharasutha Phimon Lak dated 4 May 2019</a>". (2019, 4 May). <i>Government Gazette of Thailand</i>. Volume 136, Part 14 B. Page 2.