Harvard:
Nivat, D. xxxx, "King Mongkut's autograph letter to Pius IX", in Journal of the Siam Society, vol. 37, no. 2,
APA:
Nivat, D. (xxxx). King Mongkut's autograph letter to Pius IX. Journal of the Siam Society, 37 (2) , .
Chicago:
Nivat, Dhani. xxxx. "King Mongkut's Autograph Letter To Pius IX." In Journal of the Siam Society, 37 , no. 2: .
MLA:
Nivat, Dhani. "King Mongkut's Autograph Letter To Pius IX." Journal of the Siam Society. 37.2 (xxxx): .
Citation within the text:
(Nivat xxxx)
Zotero:
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BibTeX:
@article{nivatxxxxking,
  title = {King Mongkut's autograph letter to Pius IX},
  author = {NIVAT, Dhani},
  journal = {Journal of the Siam Society},
  year = {xxxx},
  volume = {37},
  number = {2},
  address = {Bangkok},
  keywords = {Thailand;History;By Period;1767-1932},
  BAS = {168380},
  source = {bas},
}