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Bliss, Sara
Page One Publishing, 2003
Buku Referensi
Pile, John F.
H.N. Abrams, 1995
Buku Teks SO
Whiton, Sherrill
HarperCollins, 1974
Buku Teks SO
Leach, Sid DelMar
McGraw-Hill, 1983
Buku Teks SO