How To Write About Externship On A Resume . Once you have a better understanding of. Before building your resume, you should take a moment to. Medical Assistant Externship Resume Samples QwikResume from www.qwikresume.com These six steps will help you write an impressive resume that showcases the unique skills you would bring to an internship: Here’s how to put an internship on a resume: An externship is an unpaid, short and informal internship provided to students to get an exposure of how the work will be at a company or facility.