edited by Robbin F. Laird and Erik P. Hoffman
Aldine de Gruyter, 1986
Buku Teks
Guoli, Liu, 1961-, author
Palgrave, 2017
Buku Teks
Dallin, David J., author
Yale University Press, 1956
Buku Teks
Knauth, Oliver D.
Nasional Planning Association, 1960
Buku Teks
Oxford University Press, 1951
Buku Teks