The psychology of happiness, by: Michael Argaile

Contains hundreds of different studies, and as part of the author's style in presenting ideas and results, the author relied on studying hundreds of scientific studies issued by major research institutions and global universities in every detail of the research, then compares between them, studies the results of each to come up with a conclusion and final result supported by numbers, statistics, and findings. In his research, he also studied the following factors, their relationships, and their impact on happiness (work and unemployment, leisure time, age, gender, social relationships, personality, joy, feeling of life satisfaction, health, money, and other factors). 312 pages