Enders, Walter
John Wiley & Sons, 1995
Buku Teks
Maddala, G.S., author
Macmillan, 1989
Buku Teks
Ramanathan, Ramu, author
Orlandno Harcourt Brace Jovanovich College, 1992
Buku Teks
Chow, Gregory C., author
McGraw-Hill, 1983
Buku Teks
Gujarati, Damodar N., author
McGraw-Hill , 1988
Buku Teks