Unwin, Tim, author
Longman Scientific & Technical, 1992
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1981
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 19880
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1981
Buku Teks
Martin, A.W.
Rigby Limited, 1962
Buku Teks