edited by Anna M. Babel
Cambridge University Press, 2016
Buku Teks SO
Ball, Rodney
Routledge, 1997
Buku Teks SO
Jahr, Ernst Hakon
Edinburgh University Press Ltd, 2014
eBooks
Hill, John W.
Prentice-Hall, 1975
Buku Teks SO
edited by C. Everett Koop, Clarence E. Pearson, M. Roy Schwarz ; foreword by Jimmy Carter
Jossey-Bass, 2000
Buku Teks