Prochonow, Herbert V.
Prentice-Hall, 1950
Buku Teks
Braverman, Avishay, author
World Bank, 1989
Buku Teks
Dolan, John F., author
Warren, Gorham & Lamont, 1991
Buku Teks
Dolan, John F., author
Graham & lamont, 1996
Buku Teks
Reed, Edward Wilson, 1913-, author
Bumi Aksara, 1995
Buku Teks