1. Alexander, Carol (2000). A Primer on the Orthogonal GARCH Model, ISMA Centre. ISMA Centre Working Paper.
2. Alexander, Carol (2001). Orthogonal GARCH, Prentice-Hall.
3. Ali, Yansen, and Mehrotra, Sanjay (2008). Simplifying the Portfolio Optimization Process via Single Index Model, Northwestern University.
4. Pengaruh Kepemilikan Pemerintah Terhadap Kinerja Perusahaan Badan Usaha Milik Negara Yang Terdaftar Di BEI;Angela;Studi Akuntansi dan Keuangan Indonesia,2019
5. Atahau, Apriani Dorkas Rambu (2014). Loan Portfolio Structures, Risk and Performance of Different Bank Ownership Types: An Indonesian Case, Curtin University.