Boodish, H.M., author
McGraw-Hill, 1949
Buku Teks
Mayo, Elton, author
Routledge, 1949
Buku Teks
Fitzgerald, Walter, author
Methuen, 1952
Buku Teks
Faunce, William A.
McGraw-Hill, 1968
Buku Teks
Blum, Milton L., author
Harper & Brothers , 1956
Buku Teks