Chen, Kuan I., author
Bookman Associates, 1960
Buku Teks
Carr-Saunders, A.M., author
Frank Cass, 1964
Buku Teks
Population Reference Bureau, Inc., 1972
Buku Teks
Brown, Lester R.
W.W. Norton & Company, Inc., 1974
Buku Teks
Petersen, William, author
Macmillan, 1961
Buku Teks