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HOTMAN SIAHAAN, Drs and SOETANDYO WIGNJOSOEBROTO, MPA and HERWANTO, Drs and I.B.WIRAWAN, Drs. (1981) STRUKTUR KEMISKINAN MASYARAKAT PETANI DIPEDESAAN. LEMBAGA PENELITIAN UNIVERSITAS AIRLANGGA. (Unpublished)
HOTMAN SIAHAAN, Drs. and SOETANDYO WIGNJOSOEBROTO, MPA and HERWANTO, Drs. and IB. WIRAWAN, Drs. (1981) STRUKTUR KEMISKINAN MASYARAKAT PETANI DIPEDESAAN. LEMBAGA PENELITIAN UNIVERSITAS AIRLANGGA. (Unpublished)