Jackson, W.A. Douglas, author
Prenciton-Hall , 1964
Buku Teks
Flint, Colin, author
Pearson/Prentice Hall, 2007
Buku Teks
Flint, Colin, author
Taylor and Francis Group, 2018
Buku Teks
Flind, Colin, author
Routledge, 2018
Buku Teks
Carlson, Lucile, author
Prentice-Hall, 1960
Buku Teks