Sharp, Mick
London Blandford 1997,
Buku Referensi
Sharp, Mick, author
Blandford, 1997
Buku Referensi
Orum, Anthony M., author
Blackwell, 2003
Buku Teks
Ayyar, R.V. Vaidyanatha, author
Oxford University Press, 2016
eBooks
Thomson Wadsworth, 2003
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