- http://www.crystalinks.com/romearchitecture.html
- http://www.oneonta.edu/faculty/farberas/arth/arth200/politics/roman_architecture.html
- http://rome.mrdonn.org/builders.html
- http://www.roman-colosseum.info/roman-architecture/ancient-roman-architecture.htm
Planning Factors
- Cities of the World Textbook
- http://www.idealcity.org.au/index.html
- http://www.spur.org/events/calendar/ancient-roman-city-planning
- http://italian.classic-literature.co.uk/history-of-rome/01-the-period-anterior-to-the-abolition-of-the-monarchy/pages.html
Environmental Factors
- http://www.environmentalgraffiti.com/offbeat-news/environmentalism-in-100-ad/769
- http://www.radford.edu/~wkovarik/envhist/1ancient.html
- http://www.thejakartapost.com/news/2011/01/03/getting-root-environmental-problems.html
Economic Factors
- http://library.thinkquest.org/13406/16/
Political Factors
- http://www.historylearningsite.co.uk/how_was_rome_governed.htm
- http://history.howstuffworks.com/ancient-rome/rome-and-the-roman-empire4.htm
- http://wikimapia.org/1234745/Palazzo-Senatorio-Senate-Palace-Rome-City-Hall
Social Factors
- Cities of the World Textbook
- http://www.historyguide.org/ancient/lecture13b.html
- http://www.roman-empire.net/society/society.html
- http://www.exovedate.com/ancient_timeline_six.html
- http://www.history.com/topics/ancient-rome