Co-Authors Abdullah Anggriani, Theresia Berman Panjaitan C Cholish Ginting, Berta Br. Hasibuan, Mega Hutajulu, Elferida Munthe, Parlindungan Naibaho, Penteris Rumissar P Nasution, Ayu Siti Namira Ndruru, Tuberta Nduru, Tuberta Nobert Sitorus Regina Sirait - S Suparmono Sibarani, Baringin Simangunsong, Juanto Simanjuntak, Andrean V. Simanjuntak, Andrean V. H. simanjuntak, benrad edwin Sinambela, Haksa Siregar, Nova Legahati Sri Wahyuni Tania Alda Z Zumhari