You should use the Turkish version of the Recommendation Letter and Evaluation Forms if you apply to Turkish firms.
You can download the Evaluation Form from the link below. Fill out Evaluation Form and Employer Letter (Staj Basari Belgesi ve Isveren Anketi), print two copies of the it and attach a recent photograph. You should get the Evaluation Form and Employer Surveys sealed by Student Affairs Secretary, Yeter Halis (Room IE 128) and pick back the sealed Evaluation Form and Employer Surveys.
Note that Employer Survey is integrated to the Evaluation Form. You must get it filled by the company you have made your summer practice and return it with the Evaluation Form.
You can also pick up the hard-copies of these forms from Student Affairs Secretary (room IE 128).