RECOMMENDED: Radiography Essentials for Limited Practice, 6th Edition, by Long, Frank and Ehrlich, 6th edition - ISBN: 9780323661874
 
RECOMMENDED: Workbook and Licensure Exam Prep for Radiography Essentials for Limited pracice, 6th edition - ISBN# 9780323673150
 
RECOMMENDED: Merrill's Atlas of Radiographis Positioning and Procedures: Vol 1, 14th Edition. ISBN: 9780323567688
 
You can order them directly from: Evolve.elsevier.com or possibly Amazon.com