Bartholomew, David J., author
John Wiley & Sons, 1981
Buku Teks
Sackheim, George I., author
Macmillan, 1968
Buku Teks
Barrow, Gordon M., author
McGraw-Hill, 1981
Buku Teks
North-Holland, 1963
Buku Teks
Schwartz, Laurent, author
Addison-Wesley , 1966
Buku Teks