Nelson, J. L. (1977). Population and progress: Is there a conflict? (2ª ed.). Prentice Hall.
Chicago-čujuhus (17. p.)Nelson, Jack L. Population and Progress: Is There a Conflict? 2ª ed. Prentice Hall, 1977.
MLA-čujuhus (9. p.)Nelson, Jack L. Population and Progress: Is There a Conflict? 2ª ed. Prentice Hall, 1977.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.