Auernheimer, Leonardo
John Wiley , 1982
Buku Teks
Kamerschen, David R., author
South-Western Publishing, 1992
Buku Teks
Chandler, Lester Vernon, 1905-, author
Harper & Row , 1959-1973
Buku Teks
Whittlesey, Charles R., author
Macmillan, 1967
Buku Teks
Auerbach, Robert D., author
Macmillan, 1989
Buku Teks