Gulati, P., author
Tata McGraw-Hill, 1984
Buku Teks
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
edited by D.V. Glass and D.E.C. Eversley
E. Arnold, 1965
Buku Teks