Final answer:
Books like 'The Challenge of World Poverty' by Gunnar Myrdal and 'Evicted' by Matthew Desmond are key works that have revealed the number of people living in poverty through their detailed studies and personal narratives.
Step-by-step explanation:
Several books revealed the number of people living in poverty, each providing unique insights into the challenges and dynamics of impoverished populations. Prominent examples include The Challenge of World Poverty by Gunnar Myrdal, Poor Economics by Abhijit V. Banerjee and Esther Duflo, and Evicted: Poverty and Profit in the American City by Matthew Desmond. Desmond's work as an ethnographer offers a close-up view of eight families in Milwaukee and the difficulties they face with housing, highlighting the everyday reality for many poor Americans.