Ho, Tae-jeon, author
Elizabert, 2008
Buku Teks
Jeon, Ho-Tae, author
Nj. Seoul : Hollym, 2012
Buku Teks
Murdock, George Peter, author
McGraw-Hill, 1959
Buku Teks
edited by Deborah Cherry
Blackwell, 2005
Buku Teks
Latourette, Kenneth Scott, author
Macmillan, 1957
Buku Teks