The Lincoln Institute of Land Policy takes an in-depth look at housing density and what is going to be needed in the future with an expected 100 million more people in the United States by 2050 with the book Visualizing Density by Julie Campoli and Alex MacLean.  The book attempts to assist planners, designers, public officials, and citizens to better understand density in order to plan for density that leads to positive results in the future.  Take a deeper look into Visualizing Density here.