Voice of America Forum Lectures , 1968
Buku Teks
Johnston, R.J. (Ronald John)
Routledge, 2016
Buku Teks
Jackson, W.A. Douglas
John Wiley & Sons, 1985
Buku Teks
edited by Daniel B. Botkin [and others]
Academic Press, 1989
Buku Teks
Crowe, Norman
MIT Press, 1995
Buku Teks