translated by Zhai Jiangyue
Guangxi University Press , 2005
Buku Teks
Trewartha, Glenn T., author
McGraw-Hill, 1954
Buku Teks
Ahrens, C. Donald, author
Brooks/Cole, Cengage Learning, , 2011
Buku Teks
Republik Indonesia, 1994
Buku Referensi
Aguado, Edward
2001
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