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Lee, Lee, Ji-young (December 2013). "Hangeul"(PDF). The Understanding Korea Series (UKS). Archived from the original(PDF) on 9 March 2021. Retrieved 6 June 2023.
Lee, Lee, Ji-young (December 2013). "Hangeul"(PDF). The Understanding Korea Series (UKS). Archived from the original(PDF) on 9 March 2021. Retrieved 6 June 2023.
Lee, Lee, Ji-young (December 2013). "Hangeul"(PDF). The Understanding Korea Series (UKS). Archived from the original(PDF) on 9 March 2021. Retrieved 6 June 2023.