Jensen, Alfred
Edward Arnold, 1991
Buku Teks
Olsen, Gerner A., author
Prentice-Hall, 1982
Buku Teks
Granet, Irving, author
Reston, 1979
Buku Referensi
Singer, Ferdinand L., author
Erlangga, 1985
Buku Teks
Tripathi, Rajesh, author
S.S. Mubarak Brothers, 1996
Buku Teks