Kehm, Barbara M
Wittenberg and Bucharest, 1999
Buku Teks
Mood, Alexander McFarlane, 1913-, author
McGraw-Hill, 1973
Buku Teks
Newman, John Henry
J. M. Dent & Sons Ltd., 1956
Buku Teks
edited by James Arvanitakis, David J. Hornsby
Palgrave Macmillan, 2016
Buku Teks
William Locke, editor
Springer, 2011
Buku Teks