Key graduate-level textbooks for nuclear engineering include "Glasstone and Sesonske" volumes 1 and 2, which are highly recommended. Other notable texts are Donald Olander's "Fundamental Aspects of Nuclear Reactor Fuel Elements," and "Nuclear Reactor Analysis" by Duderstadt & Hamilton, which is considered advanced. "Fundamentals of Nuclear Science and Engineering" by J. Kenneth Shultis and R. E. Faw, along with "Introduction to Nuclear Concepts for Engineers" by R. M. Mayo, are also mentioned as valuable resources. The Nucleonica web portal offers additional online tools and documentation for nuclear science. These texts cater to various aspects of nuclear engineering, supporting both foundational and specialized studies.