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Buku Teks SO
Restarick, Henry Bond
Yale University Press , 1931
Buku Teks
Martin, Bernard
William Heinemann, 1944
Buku Teks SO
Martin, Bernard, 1897-1986.
W.Heineman, 1944
Buku Teks
Hutagaol, Savitra B.
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1982
UI - Skripsi Membership