Bradsher, Earl L.
The Columbia University Press, 1912
Buku Teks
Carey, Peter, author
University of Quesland Press, 1985
Buku Teks
edited by Daniel I. McNamara
Thomas Y. Crowell, 1948
Buku Referensi
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Korea Foundation, 1994
Buku Teks