Maddala, G.S., author
Macmillan, 1989
Buku Teks
Gujarati, Damodar N., author
McGraw-Hill , 1988
Buku Teks
Stewart, Jon, author
Hutchinson, 1976
Buku Teks
Gujarati, Damodar N., author
McGraw-Hill , 2009
Buku Teks
Kennedy, Peter, author
MA Blackwell Publishing, 2008
Buku Teks