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Buku Teks SO
Dito anurogo
Gramedia Pustaka Utama, 2016
Buku Teks SO
Milburn, Michael P.
The Crossing Press, 2001
Buku Teks SO
edited by Russell L. Cecil and Robert F. Loeb
W.B. Saunders, 1951
Buku Teks
Konner, Melvin
BBC Books, 1993
Buku Teks SO