Mumtazinur 2019, hlm. 73. Mumtazinur (2019). Ilmu Sosial dan Budaya Dasar(PDF). Banda Aceh: Lembaga Kajian Konstitusi Indonesia (LKKI) Fakultas Syariah dan Hukum, Universitas Islam Negeri (UIN) Ar-Raniry. ISBN978-602-50172-4-7.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Mumtazinur 2019, hlm. 74. Mumtazinur (2019). Ilmu Sosial dan Budaya Dasar(PDF). Banda Aceh: Lembaga Kajian Konstitusi Indonesia (LKKI) Fakultas Syariah dan Hukum, Universitas Islam Negeri (UIN) Ar-Raniry. ISBN978-602-50172-4-7.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Mumtazinur 2019, hlm. 116. Mumtazinur (2019). Ilmu Sosial dan Budaya Dasar(PDF). Banda Aceh: Lembaga Kajian Konstitusi Indonesia (LKKI) Fakultas Syariah dan Hukum, Universitas Islam Negeri (UIN) Ar-Raniry. ISBN978-602-50172-4-7.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Karen Bakker, "Archipelagos and networks: urbanization and water privatization in the South"; The Geographical Journal 169(4), December 2003; DOI:10.1111/j.0016-7398.2003.00097.x. "The diversity of water supply management systems worldwide—which operate along a continuum between fully public and fully private—bear witness to repeated shifts back and forth between private and public ownership and management of water systems."
Annez, Patricia Clarke; Buckley, Robert M. (2009). "Urbanization and Growth: Setting the Context"(PDF). Dalam Spence, Michael; Annez, Patricia Clarke; Buckley, Robert M. Urbanization and Growth. ISBN978-0-8213-7573-0. Diarsipkan dari versi asli(PDF) tanggal 25 May 2017. Diakses tanggal 20 May 2017.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Patterns of Urban and Rural Population GrowthDiarsipkan 2018-11-13 di Wayback Machine.", Department of International Economic and Social Affairs, Population Studies No. 68; New York, United Nations, 1980; p. 15. "If the projections prove to be accurate, the next century will begin just after the world population achieves an urban majority; in 2000, the world is projected to be 51.3 per cent urban."
Annez, Patricia Clarke; Buckley, Robert M. (2009). "Urbanization and Growth: Setting the Context"(PDF). Dalam Spence, Michael; Annez, Patricia Clarke; Buckley, Robert M. Urbanization and Growth. ISBN978-0-8213-7573-0. Diarsipkan dari versi asli(PDF) tanggal 25 May 2017. Diakses tanggal 20 May 2017.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Patterns of Urban and Rural Population GrowthDiarsipkan 2018-11-13 di Wayback Machine.", Department of International Economic and Social Affairs, Population Studies No. 68; New York, United Nations, 1980; p. 15. "If the projections prove to be accurate, the next century will begin just after the world population achieves an urban majority; in 2000, the world is projected to be 51.3 per cent urban."