Mayer, Frederick, author
American Book Company, 1951
Buku Klasik
Universitas Indonesia, 2013
UI - Skripsi (Membership)
Universitas Indonesia, 2013
UI - Skripsi (Membership)
Diakonoff, Igor M.
Cambridge University Press, 1999
Buku Teks
Young, Robert
Routledge, 1990
Buku Teks