Somers, Harold M., author
Blakiston, 1949
Buku Teks
Taylor, Philip E., author
Macmillan, 1953;1948
Buku Teks
Hey, L., author
Sie Isaac Pitman, 1972
Buku Teks
Brownlee, O.H. (Oswald Harvey), 1917-, author
Prentice-Hall, 1954
Buku Teks
Iqbal, Zamir, author
John Wiley & Sons, 2011
Buku Teks