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Buku Referensi
Bazin, Rene
New York Henry Holt 1945
Buku Teks
Hirth, F., author
The Statistical Department of The in Pectorate General of Customs, 1888
Buku Referensi
Anyang Sot'ong, 2014
Buku Teks
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2011
UI - Skripsi (Open)