Johnson, Ross H.
Houghton Miffiln, 1976
Buku Teks
Bensoussan, Alain.
North-Holland Pub. Co, 1974
Buku Teks
Mays, Larry W.
McGraw-Hill, 1992
Buku Teks
Eppen, Gary D.
Prentice Hall International, 1988
Buku Teks
Levin, Richard I.
McGraw-Hill International, c1982
Buku Teks