Volume 30, Issue 5, September and October 2018, Pages 247-253
10.22038/ijorl.2018.26701.1871
Tengku-Siti-Hajar Haryuna, Agustinus-Hamonangan-Winston Purba, Farhat Farhat, Widayat Alviandi
Volume 30, Issue 3, May and June 2018, Pages 167-170
10.22038/ijorl.2017.23203.1772
Sadegh Jafarzadeh, Mohammad Reza Golrokhian Sani