Sindy Yulia Putri, author
2016
UI - Tesis (Membership)
Williams, Robert, author
Gower, 1991
Buku Teks
Lynne Rienner Publisher, Inc, 1986
Buku Teks
Monga, Celestin, author
Lynne Rienner, 1996
Buku Teks
Robertson, Hector Menteith, author
Cambridge University Press, 1957
Buku Teks