Boyd, Harper W., Jr.
Richard D. Irwin, 1977
Buku Teks
Fifi Octavia
Fakultas Eknonomi dan Bisnis Universitas Indonesia, 2010
UI - Tesis Open
Roman, Murray
McGraw-Hill, 1976
Buku Teks
Piirto, Rebecca
American demographics Books, 1992
Buku Teks
Nangoi, Ronald
Pustaka Sinar Harapan, 1997
Buku Teks