From the book reviews:

“This book is an excellent introduction to set theory. Dasgupta (Univ. of Detroit Mercy) promotes reader/student interaction by integrating problems throughout the text instead of just providing occasional exercise sets. … The book contains more than 630 frequently challenging exercises that will interest both upper-division students and readers with strong mathematical backgrounds. Summing Up: Highly Recommended. Upper-division undergraduates and above.” (D. P. Turner, Choice, Vol. 52 (6), February, 2015)

“This undergraduate textbook provides a thorough examination of the cardinals, ordinals, and the continuum. … This work is a good introduction and would serve for two semesters of upper undergraduate study. … Each part ends with remarks that are a departure point for further exploration. … The author’s clear interest in the subject matter and economy of presentation makes this an effective tool for learning set theory in the lecture hall or through self-study.” (Tom Schulte, MAA Reviews, November, 2014)

“The present undergraduate textbook develops the core material on cardinals, ordinals, and the real line ℝ in an informal, predominantly intuitive but nevertheless concrete and rigorous manner. … this lucidly written undergraduate set theory textbook is a welcome addition to the relevant literature, with many individual features and a remarkably high degree of thematic versatility.” (Werner Kleinert, zbMATH, Vol. 1286 (2), 2014)