1. An introduction to kernel and nearest-neighbor nonparametric regression;Altman,;The American Statistician,1992
2. Anselin, L. (2003). Spatial Econometrics. In Baltagi, B.H. A Companion to Theoretical Econometrics (pp. 310-330). Germany: Blackwell Publishing Ltd.
3. Congdon, P. (2013). Bayesian Spatial Statistical Modeling. In Fischer, M.M., & Nijkamp, P. Handbook of Regional Science (pp. 141-1434). New York: Springer.
4. Hubungan antara Hasil Uji Kognitif Try Out Ujian Nasional (UN) dengan Hasil Ujian Nasional (UN) Mata Pelajaran Kimia SMA Kota Banda Aceh Tahun Ajaran 2014/2015;Elfiza,;Jurnal Ilmiah Mahasiswa Pendidikan Kimia (JIMPK),2016
5. The Future of Schooling in Indonesia;Firman,;CICE Hiroshima University, Journal of International Cooperation in Education,2008