Legal Encyclopedias are an excellent way to start your research into Georgia Landlord/Tenant Law, since they focus on providing an accessible overview of the law. Georgia Jurisprudence (Westlaw) focuses its coverage of Landloard/Tenant law in Part Seven: Chapters 26-29, but you should still look for additional coverage via the 'Landlord Tenant' index search.
National Legal Encyclopedias focus on providing an accessible overview of the law. This means that they can often be a good way to start your research into Federal Landlord/Tenant Law, although you need to be careful, since they also include coverage of all 50 states.
The scholarly commentary found in law review articles makes them an essential source for scholarly or academic legal projects. They can also be of use in more practically-oriented research, especially. If you can find an article that closely matches your issue. You can use these links to search HeinOnline and Westlaw for relevant law review articles.
Most of these titles are conveniently located at the College of Law Reference Desk.