Benham, Frederic
New York, N.Y. Sir Issac Pitman 1941,
Buku Teks
Benham, Frederic
New York, N.Y. Pitman 1947,
Buku Teks
Lutz, Vera
Oxford University Press , 1962
Buku Teks
Russel, Frederic A.
McGraw-Hill, 1955
Buku Teks
Russell, Frederic A.
McGraw-Hill, 1959
Buku Teks