University of Surrey, 2004
Buku Teks
Kim, Young Soo
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1990
UI - Tesis Membership
edited by C.K. Webster
Oxford University Press, 1938
Buku Teks SO
Artikel Jurnal
Han Jae-yong ... [and others]
Thaehaksa, 2010
Buku Referensi