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
James, Preston E., author
John Wiley & Sons, 1980
Buku Teks
Febvre, Lucien, author
Routledge, 1996
Buku Teks