Edmund Roberts, Embassy to the Eastern courts of Cochin-China, Siam, and Muscat: in the U. S. sloop-of-war Peacock ... during the years 1832-3-4, Harper & Brothers, (1re éd. First published in 1837), 310–311 p. (lire en ligne), « Chapter XX―Division of Time » :
« [T]he capital [is] called Si-a-Yuthia, (pronounced See-ah-you-té-ah....) »
(en) Pavin Chachavalpongpun, Reinventing Thailand: Thaksin and His Foreign Policy, Institute of Southeast Asian Studies, (ISBN978-981-4279-19-2, lire en ligne), p. 10
(en) Donald E. Weatherbee, Historical Dictionary of United States-Southeast Asia Relations, Scarecrow Press, (ISBN978-0-8108-6405-4, lire en ligne), p. 302
(en) Pavin Chachavalpongpun, Reinventing Thailand: Thaksin and His Foreign Policy, Institute of Southeast Asian Studies, (ISBN978-981-4279-19-2, lire en ligne), p. 67
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(en) « MFA Thailand », sur cb4ibm.iom.int (consulté le )