Book excerpt: Published in collaboration with the ONS, this Study Guide is a must-have for those who are taking the certification exam. The chapters parallel those presented in the Core Curriculum for Oncology Nursing, 4e. The number of questions in each chapter will correspond with the percentage of questions on that particular topic included in the certification exam. Answers and rationales for correct and incorrect responses are listed at the end of each chapter. The book also includes an updated bibliography for each subject.