Wild, John J., author
Pearson, 2016
Buku Teks
Fuwa Yoshitaro, Yoshida Hidemi
Foundation for Advanced Studies on International Development , 2001
Buku Teks
Oliva Blanchette, Tomonobu Imamich, George F. McLean
The Council for Research in Values and Philosophy, 2001
Buku Teks
editor, Oliva Blanchette, Tomonobu Imamich, George F. McLean, Togi M. P. Pangaribuan
The Council for Research in Values and Philosophy , 2001
Buku Teks
Artikel Jurnal