edited by Rodolfo A. Bulatao
Population Center Foundation, 1976
Buku Teks
Berger, Morroe
D. Van Nostrand, 1954
Buku Teks SO
Ohlin, Goran
OEDC, 1967
Buku Teks
Borrie, W.B.
Weidenfeld and Nicolson, 1970
Buku Teks SO
Morrison, John
Penguin Books, 1985
Buku Teks SO