Seondeok was Queen of the Silla kingdom of Korea, one of three separate, often warring, kingdoms on the peninsula. She led Silla through a time where it's very existence was threatened, and began to set it on the path to dominance that would bear fruit soon after her death.
Lee Ki-baik, A New History of Korea. Translated by Edward Wagner, 1984.
Tae-Don Noh, "A Study of Koguryŏ Relations Recorded in the Silla Annals of the Samguk Sagi", Korean Studies, 2004
Chong Sun Kim, "Silla Economy and Society", Korean Studies, 2004
Chong Sun Kim, "Sources of Cohesion and Fragmentation in the Silla Kingdom", Journal of Korean Studies, 1969.
Ancient History Encyclopedia, Marc Cartwright, "Queen Seondeok"