Zelinsky, Wilbur
Prentice Hall International, 1970
Buku Teks
Russell, Sir E. John
George Allen and Unwin, 1961
Buku Teks
The Population Council, 1970
Buku Teks
Malthus, Thomas Robert
J. M. Dent & Sons, 1952
Buku Teks
edited by D.V. Glass and D.E.C. Eversley
E. Arnold, 1965
Buku Teks