Natural Heritage Division, Cultural Heritage Administration of Korea, 2009
Buku Referensi
edited by David Brower
Sierra Club, 1961
Buku Teks
Pallister, Anne, author
Oxford University Press, 1972
Buku Teks
Korean Overseas Information Service
Hollym, 2003
Buku Teks
Suh, Jai-sik, 1956-, author
Hollym Elizabeth, 2001
Buku Referensi