six major jialect areas in Korea from National Geography Information Institute (2017) The National Atlas of Korea, Seoul: Ministry of Land Infrastructure and Transport, p. 37
Yukchin in Korea: King, J. R. P. (1987), "An introduction to Soviet Korean", Language Research23(2): 233–274, map on p. 237, reproduced from Kim Thay Kyun (1983), p. 34.
Hamgyŏng and Yukchin in China (where they are called North-central and Northeast respectively): Chinese Academy of Social Sciences (2012), Zhōngguó yǔyán dìtú jí (dì 2 bǎn): Shǎoshù mínzú yǔyán juǎn 中国语言地图集: 第2版. 少数民族语言卷 [Language Atlas of China (2nd edition): Minority language volume], Beijing: The Commercial Press, ISBN978-7-100-07053-9, Map C1-7.
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