8-12  Non-FAA publications are available through the GPO and from the National Technical Information Service (NTIS). Publications not  printed by the U.S. Government Printing Office are available from the many publishers and suppliers of books. Commercial  publishers usually provide catalogues and toll-free numbers or websites for ordering their products.  This chapter discussed the responsibilities of aviation instructors to the learner, the public, and the FAA in the training process. The  additional responsibilities of flight instructors who teach new learner pilots as well as rated pilots seeking add-on certification, the  role of aviation instructors as safety advocates, and ways in which aviation instructors can enhance their professional image and  development were explored.  Professional aviation instructors should continue to expand their knowledge and skills in order to remain competent. The field of  aviation is advancing, and the instructor also needs to advance. Instructors can best do this by taking advantage of the wide variety of  materials available from the FAA, other government agencies, commercial publishers and vendors, and from industry trade groups.  These materials are available at training sessions and seminars, from printed books, papers, magazines, and from the internet and  other electronic sources. Instructors who commit to continuing education are able to provide the highest quality instruction to their  learners.  Access to the internet via personal computers, tablets, and smartphones has opened up a vast storehouse of information for the  aviation instructor at the FAA website, www.faa.gov and many, many other websites and apps.  Electronic Sources  Chapter Summary  Figure 8-9.  Aviation instructors can improve their knowledge by becoming familiar with information on the internet. 