King, David (Aug 1, 1995). "The Orientation of Medieval Islamic Religious Architecture and Cities". Journal for the History of Astronomy. 26 (3): 253–274. Bibcode:1995JHA....26..253K. doi:10.1177/002182869502600305 – โดยทาง ProQuest.
gutenberg.org
Xenephon (January 1998). Oeconomicus. Gutenberg Press. สืบค้นเมื่อ 11 June 2015.
harvard.edu
ui.adsabs.harvard.edu
King, David (Aug 1, 1995). "The Orientation of Medieval Islamic Religious Architecture and Cities". Journal for the History of Astronomy. 26 (3): 253–274. Bibcode:1995JHA....26..253K. doi:10.1177/002182869502600305 – โดยทาง ProQuest.
