Rothman, Stanley
Bobbs-Merril Company, 1970
Buku Teks
MacIver, Robert M., author
Atherton Press, 1969
Buku Teks
MacIver, Robert M., author
Atherton Press, 1969
Buku Teks
Nugent, Neill, author
Macmillan, 1994
Buku Teks
Oxford University Press, 2003
Buku Teks