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Buku Teks
Hutabarat, Ramly, author
Ghalia Indonesia, 1985
Buku Teks
Forer, Lois G.
Norton, 1984
Buku Teks
Tawney, R.H., author
George Allen and Unwin, 1952
Buku Teks
Suwarta, author
Fakultas Hukum Universitas Indonesia, 2009
UI - Skripsi (Open)