Co-Authors Anggun Tiur Ida Sinaga Aprido Bernando Simamora Bertaria Sohnata Hutauruk Dhillon, Bobby Pramjit Singh Firman Pangaribuan Januardani, Fandra Dikhi Manurung, Elisabeth Jessika Napitupulu, Selviana Pasaribu, Donna Ria Prini Desima Evawani Ambarita Siahaan, Theresia Sihombing, Lisbet Simamora, Aprido.B. Simamora, Rianita Sipayung, Rosintan Siregar , Nurliani Siringo - ringo, Elisabeth Syamsul Bahri Tampubolon, Helena Novitasari Tiara K Pasaribu Yusmalinda Yusmalinda, Yusmalinda