Google Books will show you handfuls of secondary sources (historical treatments of a subject or era) that have been somewhat recently published. Many of them are available via UW campus libraries. Books like Gina Kolata’s Flu and Jeremy Brown’s Influenza: The Hundred-Year Hunt to Cure the Deadliest Disease in History offer great background (and often prophetic language) for a study of COVID-19. These and other titles investigate the impact on the world in 1918, and then, one can relate those discussions to themes of resiliency, anxiety, dismissal, fear, survival, and education in 2020.
Here are a couple of fiction books that reinforce the impact and humanity of our earlier Pandemic. Even the perennially popular Rascal, from Wisconsin’s Sterling North, has a section on the Spanish Flu.