Wade, Thomas L.
McGraw-Hill, 1974
Buku Teks SO
Andrews, Donald H.
Wiley Eastern, 1965
Buku Teks
Brumfiel, Charles Francis, 1914-
Addison-Wesley, 1962
Buku Teks
Kramer, Arthur D.
McGraw-Hill, 1984
Buku Teks
by J.H. Wood ... [and others]
Evenston Harper, 1963
Buku Teks