Hawkins, Del I., author
McGraw-Hill, Irwin, 2007
Buku Teks
Fazrry, author
2015
UI - Skripsi (Membership)
Berliani Saputri, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2018
UI - Skripsi (Membership)
Piirto, Rebecca
American demographics Books, 1992
Buku Teks
Anggita Larasati, author
2017
UI - Skripsi (Membership)