Kedah Sultanate (English Wikipedia)

Ḥusain, Muẓaffar; Akhtar, Syed Saud; Usmani, B. D. (2011-09-14). A concise history of Islam. New Delhi: Vij Books India. p. 308. ISBN 9789382573470. OCLC 868069299.

britannica.com

"Kedah: Intro and Background". Go2Travelmalaysia.com. Capslock Sdn Bhd. Archived from the original on 5 October 2018. Retrieved 4 March 2011.

Winstedt, Richard (December 1936). "Notes on the History of Kedah". Journal of the Malayan Branch of the Royal Asiatic Society. 14 (3 (126)): 155–189. JSTOR 41559857.
R. O. Winstedt (December 1938). "The Kedah Annals". Journal of the Malayan Branch of the Royal Asiatic Society. 16 (2 (131)): 31–35. JSTOR 41559921.

"Unconstitutional to wipe Penang off Malaysia's map, Kedah told". Malay Mail. 11 February 2017. Archived from the original on 11 February 2017. Retrieved 11 February 2017.

"Sg Batu to be developed into archaeological hub". The Star. 3 October 2020. Retrieved 8 November 2020.

Rajanubhab, Damrong. "The royal chronicle in Rama II of Rattanakosin era". Vajirayana Digital Library (in Thai).

"Unconstitutional to wipe Penang off Malaysia's map, Kedah told". Malay Mail. 11 February 2017. Archived from the original on 11 February 2017. Retrieved 11 February 2017.
MyKedah (n.d.), Pusat- pusat Pentadbiran Kedah Darul Aman Dari Bukit Meriam Ke Kota Star, archived from the original on 4 September 2017
"Kedah: Intro and Background". Go2Travelmalaysia.com. Capslock Sdn Bhd. Archived from the original on 5 October 2018. Retrieved 4 March 2011.
Jelani Harun. "Al-Tarikh Salasilah Negeri Kedah Darul Aman Sebuah Karya Agung Melayu" (PDF). Archived from the original (PDF) on 2021-09-30. Retrieved 2019-12-18.

Ḥusain, Muẓaffar; Akhtar, Syed Saud; Usmani, B. D. (2011-09-14). A concise history of Islam. New Delhi: Vij Books India. p. 308. ISBN 9789382573470. OCLC 868069299.