Curtis, Sarah
Edward Arnold, 1996
Buku Teks
edited by Daniel B. Botkin [and others]
Academic Press, 1989
Buku Teks
Wales, Hugh G.
The University of Illinois Press , 1951
Buku Teks
William Locke, editor
Springer, 2011
Buku Teks
Hudson, Ray
Prentice-Hall, 2000
Buku Teks