I am interested in applying for the [xxx] summer internship position that was listed on/in [xxx]. I have had a great deal of [xxx] experience in [xxx]. I have performed [xxx] and I am currently doing/proficient/experienced in [xxx]. During my time at university I have also [xxx].
Last summer, I worked as [xxx]. I am seeking to complement this experience with an internship in order to acquire the background necessary for a future career in Public Relations. I believe that I would be an asset to your program. This internship would provide me with the ideal opportunity to assist within your organisation and to expand my [xxx] skills.
Thank you for taking the time to read and consider my CV, I look forward to hearing from you in the not so distant future.
[Signature in black ink]
[Full name typed]