Garb, Gerald
Macmillan, 1981
Buku Teks
Maddala, G.S., author
McGraw-Hill Book , 1989
Buku Teks
Griffiths, Alan, author
Addison Wesley Longman, 1996
Buku Teks
Nicholson, Walter, author
Dryden Press, 1994
Buku Teks
Nicholson, Walter, author
Dryden Press , 1983
Buku Teks