Jay R. Harris, Monica Morrow, Marc E. Lippman, C. Kent Osborne
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Buku Teks
J. Michael Dixon, editor
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Buku Teks
Smith, Jane
Headway , 1994
Buku Teks
Vloker Frohwein, author
Thieme, 2010
Buku Teks
Hungerford, T.A.G., author
McGraw-Hill, 1990
Buku Teks