YoviEfi Yuliati, and Suryaningsih. 1. “Noise, Worker Perception, and Worker Concentration in Timber Harvesting Activity”. Jurnal Manajemen Hutan Tropika 17 (2). Bogor, INA, 56-62. https://jurnalpenyuluhan.ipb.ac.id/index.php/jmht/article/view/3975.