The first step in research in any subject is making sure you understand your topic. Use dictionaries, encyclopedias, and other reference sources to gather background information to better understand your topic. Such reference works provide a comprehensive overview of a topic. The entries regularly include definitions and relevant information to help you situate your topic in historical and current cultural contexts. Additionally, the entries often include detailed bibliographies listing other books, articles, and internet resources on your topic.
The Urban Masterplanning Handbook by 
Encyclopedia of the City by 