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Patent
Khoirurrosyidin, Jusuf Harsono (2007) Pola Mobilitas Sosial Tenaga Kerja Indonesia Asal Ponorogo. 087111.
Khoirurrosyidin, Jusuf Harsono (2007) Pola Mobilitas Sosial Tenaga Kerja Indonesia Asal Ponorogo. 087111.