Maris, Cees, editor
Springer, 2011
eBooks
Lawler, J. John, author
Foundation Press, 1940
Buku Teks
Russell, Alexander David
Kegan Paul, Trench, Trubner , 1925
Buku Teks
Moynihan, Cornelius J., author
West Publishing, 1962
Buku Teks
Campbell, Lyle, author
Edinburgh University Press , 2013
Buku Teks