As in several fields, lots of books exist in the data mining literature. People new to any domain usually appreciate suggestions from someone in the field. With my present experience in data mining books, I would suggest Introduction to Data Mining (Tan et al., 2005). It is a readable, although not comprehensive, book about data mining with a focus on clustering. It has been reviewed in this post. Since it is not possible to read all of them, a gathering of different reading experience can be very interesting. Therefore, if you have any recommendation, feel free to give your opinion and suggest a data mining book you have liked (or even written!). I’m sure beginners and people from other fields using data mining will appreciate.