Keabsahan Pemutusan Hubungan Kerja Berdasarkan Kesalahan Berat Yang Diatur Dalam Perjanjian Kerja Bersama ( Studi Terhadap Putusan Mahkamah Agung) = Validity of the layoff on the basis of the serious mistakes set forth in the collective labor agreement (the study of the supreme court decison) - Muh. Muzakki Ismail, author (2012)