Chŏng, Yang-mo; Smith, Judith G.; Metropolitan Museum of Art (New York, N.Y.) (1998). Arts of Korea. Metropolitan Museum of Art. p. 230. ISBN9780870998508. Retrieved 30 September 2016.
International, Rotary (April 1989). The Rotarian. Rotary International. p. 28. Retrieved 30 September 2016.
Reischauer, Edwin Oldfather (May 1955). Ennins Travels in Tang China. John Wiley & Sons Canada, Limited. pp. 276–283. ISBN9780471070535. Retrieved 21 July 2016. "From what Ennin tells us, it seems that commerce between East China, Korea and Japan was, for the most part, in the hands of men from Silla. Here in the relatively dangerous waters on the eastern fringes of the world, they performed the same functions as did the traders of the placid Mediterranean on the western fringes. This is a historical fact of considerable significance but one which has received virtually no attention in the standard historical compilations of that period or in the modern books based on these sources. . . . While there were limits to the influence of the Koreans along the eastern coast of China, there can be no doubt of their dominance over the waters off these shores. . . . The days of Korean maritime dominance in the Far East actually were numbered, but in Ennin's time the men of Silla were still the masters of the seas in their part of the world."
