Hammer, Lawrence H., author
South-Western Pub. Co, 1994
Buku Teks
Usry, Milton F., author
Erlangga, 1986
Buku Teks
Schlatter, Charles F.
John Wiley & Sons, 1960
Buku Teks
Blocker, John G., author
McGraw-Hill, 1948
Buku Teks
Blocker, John G., author
Tata McGraw-Hill, 1972
Buku Teks