Breuker 2010, pp. 220–221. "The Jurchen settlements in the Amnok River region had been tributaries of Koryŏ since the establishment of the dynasty, when T'aejo Wang Kŏn heavily relied on a large segment of Jurchen cavalry to defeat the armies of Later Paekche. The position and status of these Jurchen is hard to determine using the framework of the Koryŏ and Liao states as reference, since the Jurchen leaders generally took care to steer a middle course between Koryŏ and Liao, changing sides or absconding whenever that was deemed the best course. As mentioned above, Koryŏ and Liao competed quite fiercely to obtain the allegiance of the Jurchen settlers who in the absence of large armies effectively controlled much of the frontier area outside the Koryŏ and Liao fortifications. These Jurchen communities were expert in handling the tension between Liao and Koryŏ, playing out divide-and-rule policies backed up by threats of border violence. It seems that the relationship between the semi-nomadic Jurchen and their peninsular neighbours bore much resemblance to the relationship between Chinese states and their nomad neighbours, as described by Thomas Barfield." Breuker, Remco E. (2010), Establishing a Pluralist Society in Medieval Korea, 918-1170: History, Ideology and Identity in the Koryŏ Dynasty, BRILL, ISBN978-90-04-18325-4
Ebrey & Walthall 2014, [1], p. 171, at Google Books: "In the case of the Jurchen Jin, the [Goryeo] court decided to transfer its tributary relationship from the Liao to Jin before serious violence broke out." Also p.172: "Koryŏ enrolled as a Jin tributary". Ebrey, Patricia Buckley; Walthall, Anne (2014), Pre-Modern East Asia: To 1800: A Cultural, Social, and Political History, Third Edition, Boston, MA: Wadsworth, Cengage Learning, ISBN978-1-133-60651-2.
Jeon, Yeong-ho (2021). 10~12세기 고려의 渤海難民 수용과 주변국 同化政策* [A Study on Korea's Accommodation of the Refugees from the Collapsed Kingdom of Balhae and Policy of Assimilating the Neighboring Nations in 10th~12th Centuries]. Kyobo Book Center. pp. 32–33. Archived from the original on 6 December 2021. Retrieved 6 December 2021.
Rogers 1959, pp. 20–21. Rogers, Michael C. (1959), "Factionalism and Koryŏ Policy under the Northern Sung", Journal of the American Oriental Society, 79 (1): 16–25, doi:10.2307/596304, ISSN0003-0279, JSTOR596304
Rogers 1959, pp. 20–21. Rogers, Michael C. (1959), "Factionalism and Koryŏ Policy under the Northern Sung", Journal of the American Oriental Society, 79 (1): 16–25, doi:10.2307/596304, ISSN0003-0279, JSTOR596304
Seo & Hong 2004, p. 180. Seo, Ji-Eun; Hong, Seung-Jae (2004), 고려시대 사찰 주불전의 건축 특성 연구 [A Study on the Archtectural [sic] Characteristics of main Buddhist sanctum in Koryeo Period], Journal of the Architectural Institute of Korea Planning & Design (in Korean), 20 (12): 177–186, ISSN1226-9093
Jeon, Yeong-ho (2021). 10~12세기 고려의 渤海難民 수용과 주변국 同化政策* [A Study on Korea's Accommodation of the Refugees from the Collapsed Kingdom of Balhae and Policy of Assimilating the Neighboring Nations in 10th~12th Centuries]. Kyobo Book Center. pp. 32–33. Archived from the original on 6 December 2021. Retrieved 6 December 2021.
귀주대첩(龜州大捷). 문화콘텐츠닷컴 (in Korean). Korea Creative Content Agency. Archived from the original on 27 March 2019. Retrieved 21 March 2019.
"Gutenberg Bible". Timelines: Sources from History. British Library. Archived from the original on 25 October 2016. Retrieved 8 February 2019.
Rogers 1959, pp. 20–21. Rogers, Michael C. (1959), "Factionalism and Koryŏ Policy under the Northern Sung", Journal of the American Oriental Society, 79 (1): 16–25, doi:10.2307/596304, ISSN0003-0279, JSTOR596304
Seo & Hong 2004, p. 180. Seo, Ji-Eun; Hong, Seung-Jae (2004), 고려시대 사찰 주불전의 건축 특성 연구 [A Study on the Archtectural [sic] Characteristics of main Buddhist sanctum in Koryeo Period], Journal of the Architectural Institute of Korea Planning & Design (in Korean), 20 (12): 177–186, ISSN1226-9093