Compared to a book
Flora & Fauna of Korea, vol. 25 avifauna by Won (1981)
A Field Guide to the Birds of Korea (Lee et al., 2000)
regions and the Natural heritage of Korea, the story behind natural monuments (Yee, 2009)
Endangered and Reserved Wild Species in Korea (Won and Yoon,1998)
Ornithological Society of Korea (2009).