R. Yusuf, E. Tamam, J. Bolong, and M. N. Osman, “Perilaku Membisu dalam kalangan Pekerja Malaysia di Organisasi Jerman: Satu Kajian Rintis: Silence Behavior among Malaysian Employees in German Organizations: A Pilot Study”, PERS, vol. 7, no. 2, pp. 15–25, Nov. 2015.