I certify that the attached material is my original work. No other person’s work or ideas have been used without acknowledgment. Expect where I have clearly stated that I have used some of this material elsewhere, I have not presented this for assessment in another course or unit at this or any other institution. I have retained a copy of this assignment. I have read and understand the Universitas Muhammadiyah Yogyakarta Academic Integrity at Universitas Muhammadiyah Yogyakarta: Student guidelines for avoiding plagiarism.
Yogyakarta, 25 April 2013