Bierstedt, Robert, author
McGraw-Hill, 1964
Buku Teks
edited by Norman MacKenzie
The New American Library, 1968
Buku Teks
edited by the London office of Hosein University
Hosei University , 1996
Buku Teks SO
Hunt, Elgin F., author
MacMillan, 1987
Buku Teks
Hunt, Elgin F., author
Macmillan, 1962
Buku Teks