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McGraw-Hill, 1958
Buku Teks
Horas Djulius, author
Faculty of Economic and Business UIN Syarif Hidayatullah, 2019
Artikel Jurnal
Duwi Riyadi Putra, author
2015
UI - Skripsi (Membership)
Adi Suhendra, author
Badan Penelitian dan Pengembangan Kementerian Dalam Negeri, 2018
Artikel Jurnal
United Nations, 1999
Buku Teks