Alexander, L.G., author
Longman, 1985, 1992
Buku Teks
Emalia Iragiliati Sukarni, author
Gramedia Pustaka Utama, 2000
Buku Teks
Alexander, L.G., author
Longman, 1967
Buku Teks
Alexander, L.G., author
Longman, 1964
Buku Teks
Cotton, David
Pearson Education Limited, 2012
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