ESCAP, 1982
Majalah, Jurnal, Buletin
Chen, Kuan I., author
Bookman Associates, 1960
Buku Teks
Malthus, Thomas Robert
The University of Michigan Press, 1964
Buku Teks
Ehrlich, Paul R., author
W.H. Freeman, 1970
Buku Teks
Thompson, Warren S., author
Tata McGraw-Hill, 1965
Buku Teks