2 1 10 Andri Kristianto S Primary Author Bornok Sinaga Primary Author Pardomuan N.J.M Sinambela Primary Author mixed material 9786024271152 Jakata kemdikbud 2017 Screenshot_18.png.png Sudianto Manullang Primary Author Andri Kristianto S Primary Author Tri Andri Hutapea Primary Author mixed material 9786024271169 Jakata kemdikbud 2017 Screenshot_16.png.png