Fortification (English Wikipedia)

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Ogundiran, Akinwumi (June 2005). "Four Millennia of Cultural History in Nigeria (ca. 2000 B.C.–A.D. 1900): Archaeological Perspectives". Journal of World Prehistory. 19 (2): 133–168. doi:10.1007/s10963-006-9003-y. S2CID 144422848.

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The Forts and Fortifications of Europe 1815-1945

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Ancient and Pre-Spanish Era of the Philippines Archived 2015-12-10 at the Wayback Machine. Accessed September 04, 2008.
"The Battle of Bayan". Archived from the original on December 30, 2015. Retrieved March 17, 2015.
"The Kutawato Caves". Archived from the original on October 16, 2014. Retrieved March 17, 2015.
Mubarakpuri, Saifur Rahman Al (2005), The sealed nectar: biography of the Noble Prophet, Darussalam Publications, p. 481, ISBN 978-9960-899-55-8, archived from the original on April 19, 2016 Note: Shawwal 8AH is January 630AD
Harris, J., "Sarzana and Sarzanello – Transitional Design and Renaissance Designers" Archived 2011-07-26 at the Wayback Machine, Fort (Fortress Study Group), No. 37, 2009, pp. 50–78
Mifsud, Simon (September 14, 2012). "Fort Campbell". MilitaryArchitecture.com. Archived from the original on November 15, 2015. Retrieved March 15, 2015.

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"[Kentucky Frontier] Migration & Settlement: Settling the Land". Western Kentucky University Libraries & Museum. Archived from the original on August 26, 2011. Retrieved September 13, 2012.

Fortification (English Wikipedia)

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