Sandford, Christine
Macmillan, 1955
Buku Teks
Friedrich, Carl Joachim
McGraw-Hill, 1963
Buku Teks
Riezky Darma Setyawan, author
2001
UI - Skripsi (Membership)
Brecher, Michael
Oxford University Press, 1959
Buku Teks
Page, David, editor
Oxford University Press, 1982
Buku Teks