Robinson, O.F.
Routledge, 1994
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Webster, Donald H., author
Harper & Row , 1958
Buku Teks
The International City Manager's Association
[publisher not identified], 1962
Buku Teks
Bromage, Arthur W.
Appleton-Century-Crofts,Inc., 1950
Buku Teks
The International City Manager's Association, 1950
Buku Teks