I used several Britannica articles to do my initial research. Whether that be learning about the details of Proto-Indo-European or growing my project to the scope of The Nostratic Hypothesis, Britannica was there to help me understand the basics of whatever I was researching at the time.
After doing my initial research, and realizing that I wanted to focus on The Nostratic Hypothesis, I knew I needed more details than Britannica could provide. As I was looking into the research done on The Nostratic Hypothesis, I came across Allan Bomhard's Comprehensive Introduction to Nostratic Comparative Linguistics, which helped me with the academic section of my research.
During my first IP10 week, I visited the New York Public Library (NYPL) to get access to other academic sources for my research, which allowed me to finish my research during that week.
For the final section of my research, I looked into the pre-established family trees of the various language families connected under the branch of Proto-Nostratic, allowing me to begin the creation of my felt tree.