World Bank, 2009
Buku Teks
Amling, Frederick, author
Prentice-Hall, 1965
Buku Teks
Amling, Frederick, author
Richard D. Irwin, 1977
Buku Teks
Jones, Charles P., author
John Wiley & Sons, 2000
Buku Teks
Amling, Frederick, author
Prentice-Hall, 1978
Buku Teks