Guoli, Liu, 1961-, author
Palgrave, 2017
Buku Teks
edited by Robbin F. Laird and Erik P. Hoffman
Aldine de Gruyter, 1986
Buku Teks
Knauth, Oliver D.
Nasional Planning Association, 1960
Buku Teks
Hill, Christopher, author
Palbrave Macmillan, 2003
Buku Teks
Baldwin, Robert E., author
Harvester/Wheatsheaf, 1988
Buku Teks