Ward, A. C. (Alfred Charles), 1891-
The British Council by Longmans, Green, 1959
Buku Teks
Austin, James C.
Twayne , [1964]
Buku Teks
Matz, Aaron, author
Cambridge University Press, 2011
eBooks
Nuria Widyasari, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2002
UI - Tesis Membership
Mychael, Arthur, author
McGraw-Hill, 1977
Buku Teks