Moore, John
Routledge , 1994
Buku Teks SO
edited by Kang Hyejeong and Pyo Seonghoon ; translated by Jang Gyeseong and Kim Hyekang
Published Park Ki-seok, 2005
Buku Referensi
Meij, Dick van der
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2010
Artikel Jurnal
Allan, Keith, 1943-
Cambridge University Press, 2006
Buku Teks SO
Carter, Ronald
Cambridge University Press, 1987
Buku Teks SO