Clear, James
The Habit Journal
Gramedia Pusaka Utama, 2022
 Buku Teks
Journal of Population
The Demographic Institue FE-UI, 1995
 Majalah, Jurnal, Buletin
Spafa journal
Public Company Limited, 2006
 Majalah, Jurnal, Buletin
Future journal
Jakarta : Indonesia Future Institute, 2007,
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The Japan Journal
The Japan Journal Ltd., 2008
 Majalah, Jurnal, Buletin