Forde, C. Daryll
Methuen , 1956
Buku Teks
Forde, C. Daryll
Metheun & Co. , 1963
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 1977
Buku Teks
Jonas, Andrew E. G, author
Wiley-Blackwell, 2015
Buku Teks
Lebon, J. H. G., author
Hutchinson University Library, 1969
Buku Teks