Kimball, Dexter S
McGraw-Hi, 1947
Buku Teks
Amrine, Harold T., author
Prentice-Hall, 1971
Buku Teks
Bangs, John R., author
Alexander Hamilton Institute, 1955; 1961
Buku Teks
Bethel, Lawrence L., author
McGraw-Hill Kogakusha, 1971
Buku Teks
William Wrenall, Quarterman Lee, editors in chief
McGraw-Hill, 1994
Buku Referensi