Aprianti Kartika, author
Universitas Indonesia, 2015
UI - Tesis (Membership)
by Sally J. Redfern [and others]
Macmillan, 1982
Buku Teks
Dinitto, Diana M., author
Prentice-Hall, 2000
Buku Teks
Artikel Jurnal
Sumarwati Kramadibrata Poli, author
Lembaga Penelitian Universitas Indonesia, 2003
Artikel Jurnal