Tirta N. Mursitama, Syamsul Hadi, Imadudin Abdullah and Ayudhaning P. Dewanto
International Business Management 7 ( 4 ): 359 - 367 , 2013
Tirta N. Mursitama and Yi Ying
Research Journal of Applied Sciences 10 ( 6 ): 227 - 231 , 2015