"Portfolio Selection: Efficient Diversification of Investments" by Harry M. Markowitz is a classic textbook published by Yale University Press in 1970. This book covers topics such as personal finance, investing, strategic planning, and business mathematics, making it a valuable resource for students and professionals in the field. With a focus on efficient diversification of investments, Markowitz offers insights and strategies for managing portfolios in a dynamic and ever-changing market environment. This trade paperback edition is a must-have for anyone interested in enhancing their understanding of investments and securities.