Persepsi karyawan tentang hubungan antara motivasi kerja dan disiplin kerja terhadap kinerja karyawan : studi kasus pada Kantor Pelayanan Pajak Sorong = Employees' perceptions about the relationship between work motivation and work discipline towards the employees performance : study case in Sorong tax service office - Bina Heru Setiawan, author (Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2004)