Strategi pemasaran PT. Rika dalam industri farmasi Veteriner
 UI - Tesis (Membership)
Nasution, Rika Sahara
Transaksi sale and leaseback PT Indosat Tbk = Sale and leaseback transaction at PT Indosat Tbk / Nasution, Rika Sahara
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
 UI - Tesis (Membership)
Johnson, Falk S.
Improving what you write
Houghton Mifflin, 1965
 Buku Teks
Improving women's health in India /
The World Bank, 1996
 Buku Teks
Milan, Deanne K.
Improving reading skill
Random House, 1988
 Buku Teks