Tham khảo Yên (Tam quốc)

Ikeuchi, Hiroshi. "A Study on Lo-lang and Tai-fang, Ancient Chinese prefectures in Korean Peninsula". Memoirs of the Research Department of the Toyo Bunko 5 (1930). 79–95.
Gardiner, K.H.J. "The Kung-sun Warlords of Liao-tung (189–238)". Papers on Far Eastern History 5 (Canberra, March 1972). 59–107.
Gardiner, K.H.J. "The Kung-sun Warlords of Liao-tung (189–238) – Continued". Papers on Far Eastern History 6 (Canberra, September 1972). 141–201.
Byington, Mark E. "Control or Conquer? Koguryǒ's Relations with States and Peoples in Manchuria," Journal of Northeast Asian History volume 4, number 1 (June 2007): 83–117.

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