Trewartha, Glenn T., author
McGraw-Hill, 1967
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1971
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