Marcus, Edward
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Buku Teks
Pustaka Sinar Harapan, 1985
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 SO
Fuwa Yoshitaro, Yoshida Hidemi
Foundation for Advanced Studies on International Development , 2001
Buku Teks
Wild, John J.
Pearson, 2016
Buku Teks