Thompson, Warren S., author
The University of Chicago Press, 1959
Buku Teks
Smith, T. Lynn
J. B. Lippincott Company, 1960
Buku Teks
United Nations Fund for Population Activities, 1985
Buku Teks
Malthus, Thomas
Oxford University Press, 1993
Buku Teks
Zopf, Paul E,Jr
Mayfield Publishing, 1984
Buku Teks