Group 1 - The essence of business models revolves around how to make money and how to sustain that profitability [1] - The recommended books provide insights into understanding and developing effective business models for different stages of entrepreneurship and management [2][10] Group 2 - "Manager's Reference: Business Models and Business Thinking" is essential for foundational understanding and broadening perspectives on business models, emphasizing the underlying logic of survival and expansion [4] - "From Zero to One" focuses on innovation and the importance of finding unique paths rather than copying others, highlighting that many failures stem from poor initial direction [6] - "The Wealth of Nations" offers timeless insights into division of labor, value, and market laws, which are crucial for understanding the economic principles behind business models [8][9] - "12 Essential Readings for Entrepreneurs" stresses the critical nature of business models in the early stages of entrepreneurship, helping to avoid common pitfalls [10] - "Manager's Reference: Sales and Sales Management" illustrates the direct relationship between sales and business models, emphasizing that a solid model must translate into sustainable sales and cash flow [14]