R. Gerald. S. Grisanto, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis (Membership)
Moulton, William G., author
Modern Language Association of America, 1966
Buku Teks
Mohr, V. Marie
Gunung Agung, 1984
Buku Teks
Ahearn, Laura M. author
John Wiley & Sons, Incorporated,, 2016
Buku Teks
Khaidir Anwar
Gadjah Mada University Press, 1985
Buku Teks