Harvard:
Nivat, D. and Seidenfaden, E. xxxx, "Early trade relations between Denmark and Siam", in Journal of the Siam Society, vol. 31, no. 1,
APA:
Nivat, D. and Seidenfaden, E. (xxxx). Early trade relations between Denmark and Siam. Journal of the Siam Society, 31 (1) , .
Chicago:
Nivat, Dhani and Erik Seidenfaden. xxxx. "Early Trade Relations Between Denmark and Siam." In Journal of the Siam Society, 31 , no. 1: .
MLA:
Nivat, Dhani and Erik Seidenfaden. "Early Trade Relations Between Denmark and Siam." Journal of the Siam Society. 31.1 (xxxx): .
Citation within the text:
(Nivat & Seidenfaden xxxx)
Zotero:
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BibTeX:
@article{nivatxxxxearly,
  title = {Early trade relations between Denmark and Siam},
  author = {NIVAT, Dhani and SEIDENFADEN, Erik},
  journal = {Journal of the Siam Society},
  year = {xxxx},
  volume = {31},
  number = {1},
  address = {Bangkok},
  keywords = {Thailand;History;By Period;Antiquity to 1767;Thailand;Politics & Government;International Relations;Denmark;Thailand;Library & Information Sciences;Manuscripts;Thailand;Language},
  BAS = {168397},
  source = {bas},
}