15987 336 10 Sidik Primary Author 1221412039 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Robertho Hamzah Primary Author 1221412038 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Richo Defandri Putra Primary Author 1221412034 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Rafli Setiawan Primary Author 1221412032 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Prasetio Rahmadani Primary Author 1221412030 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Muthia Arzi Primary Author 1221412028 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Muhammad Ichsan Primary Author 1221412027 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Marojahan Silitonga Primary Author 1221412026 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 M. Firman Syahputra Primary Author 1221412025 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015 Lio Prisko Ketaren Primary Author 1221412024 Additional Author mixed material Pekanbaru Pustaka Politeknik Caltex Riau 2015