Mitchell, Stephen, 1948-, author
Wiley Blackwell, 2015
Buku Teks
Boren, Henry C., author
D.C. Heath and Company, 1977
Buku Referensi
Hurst, James Willard
Macmillan, 1964
Buku Teks
Pound, Roscoe, author
Wm.W. Gaunt and Sons, 1986
Buku Teks
Robinson, O.F., author
Frofessional Books Limited, 1985
Buku Teks