[by] Merrill E. Shanks [and others]
Addison-Wesley, 1965
Buku Teks SO
Purcell, Edwin Joseph, 1901-
Erlangga, 1999
Buku Teks SO
Brumfiel, Charles Francis, 1914-
California State Department of Education , 1965
Buku Teks SO
Stewart, James, 1941-
Brooks, 1998
Buku Teks SO
Cox, Arthur F.
Harcourt Brace Javanovich, 1978
Buku Teks SO