Boughey, Arthur S., author
McMillan Publisher, 1975
Buku Teks
Graham, Peter, author
Blackwell Scientific Publications, 2003
Buku Teks
edited by Moryteza Honari and Thomas Boleyn
Routledge, 1999
Buku Teks
Gates, Frank C.
McGraw-Hill , 1949
Buku Teks
Robinson, John
McGraw-Hill, 1971
Buku Teks