Damanik, Bratara Dolok Bayu
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Bohman, Helena, editor
John Wiley & Sons, 1981
Buku Teks
Stocking, George W.
The Twentieth Century Fund , 1951
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Rini Anjaswari
2015
UI - Tesis (Membership)
Florencia Irena Chandra
2016
UI - Skripsi (Membership)