Komeil Yousefi
Heuristic approaches to solve the fixed charge transportation problem with discount supposition
Taylor and Francis, 2018
 Artikel Jurnal
Issues that the new President needs to address
 Artikel Jurnal
Mayer, John Robert
The urban transportation problem
Massachusetts Harvard University Press , 1965
 Buku Teks
Owen, Wilfred
The metropolitan transportation problem
Brookings Institution, 1966
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New approaches to conflict resolution
Ford Foundation , 1978
 Buku Teks