Columbia University - "East Asian cultural sphere"Архивирано на сајту Wayback Machine (27. фебруар 2008) "The East Asian cultural sphere evolves when Japan, Korea, and what is today Vietnam all share adapted elements of Chinese civilization of this period (that of the Tang dynasty), in particular Buddhism, Confucian social and political values, and literary Chinese and its writing system."
„East Asia”. encarta. Microsoft. Архивирано из оригинала 31. 10. 2009. г. Приступљено 12. 01. 2008. „the countries, territories, and regions of China, Mongolia, Hong Kong, Japan, North Korea, South Korea, Macau, and Taiwan.”
state.gov
„Background Note: South Korea”. State. U.S. Department of State. Приступљено 27. 04. 2000.Проверите вредност парамет(а)ра за датум: |access-date= (помоћ)
web.archive.org
Columbia University - "East Asian cultural sphere"Архивирано на сајту Wayback Machine (27. фебруар 2008) "The East Asian cultural sphere evolves when Japan, Korea, and what is today Vietnam all share adapted elements of Chinese civilization of this period (that of the Tang dynasty), in particular Buddhism, Confucian social and political values, and literary Chinese and its writing system."
webcitation.org
„East Asia”. encarta. Microsoft. Архивирано из оригинала 31. 10. 2009. г. Приступљено 12. 01. 2008. „the countries, territories, and regions of China, Mongolia, Hong Kong, Japan, North Korea, South Korea, Macau, and Taiwan.”