edited by Douglas Pratt, Jon Hoover, John Davies, John Chesworth
Brill, 2015
eBooks
Thomas, David, author
Macmillan Education , 1990
Buku Teks
Thomas, David A.
Allyn and Bacon, 1991
Buku Teks
Wise, David, author
Random House , 1964
Buku Teks
Goddard, Hugh, author
Serambi Ilmu Semesta, 2013
Buku Teks