Maddala, G.S., author
Macmillan, 1989
Buku Teks
Stewart, Jon, author
Hutchinson, 1976
Buku Teks
Kennedy, Peter, author
MA Blackwell Publishing, 2008
Buku Teks
Lahiri, Kajal, author
Wiley India, 2009
Buku Teks
Theil, Henri, author
North-Holland, 1971
Buku Teks