Majalah Ilmiah Universitas HKBP Nommensen Visi STT No. 1541/SK/Ditjen PPG/STT/1990 Volume 19 Nomor 3 Oktober 2011 : Code Mixing On The Cover Of Magazine's Headlines A Sociolinguistics Study - Sondang Manik (Universitas HKBP Nommensen, 2011)