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McGraw-Hill , 2012
Buku Teks
Harpole, Greg
McGraw-Hill Book , 1986
Buku Teks
Bredow, Miriam
McGraw-Hill, 1964
Buku Teks
Ratu Sania, author
Universitas Indonesia, 2012
UI - Skripsi (Open)
Jones, Stacy V.
Praeger Publishers, 1971
Buku Teks