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Heinemann, 1976
Buku Referensi
edited by Julie K. Ward
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Buku Teks
Dubs, Homer H., author
Arthur Probsthain, 1927
Buku Teks
United Nations Human Settlements Programme
UN-Habitat, 2008
Buku Teks
Gibb, Donald
Butterworth-Heinemann , 2000
Buku Teks