1. Adam, F. P. (2010). Tren urbanisasi di Indonesia [The trend of urbanization in Indonesia]. Piramida, 6(1), 1-15.
2. Badan Pusat Statistik Pekanbaru. (2012). Indeks pembangunan manusia (IPM) Provinsi Riau [Riau Province human development index]. BPS Pekanbaru.
3. Bandung Regional Development Planning, Research, and Development Agency. (2011). Kota Bandung dalam angka 2009 [City of Bandung in 2009]. Badan Pusat Statistik Kota Bandung.
4. Bodgan, R. C., & Biklen, S. (1982). Qualitative Research for Educations: An Introductions to Theory and Methods. Allyn and Bacon.
5. Budiyono, A. (2001). Pencemaran udara: Dampak pencemaran udara pada lingkungan [Air pollution: The impact of air pollution on the environment]. Berita Dirgantara, 2(1), 21-27. https://jurnal.lapan.go.id/index.php/berita_dirgantara/article/view/687