[9] Merriam-Webster Dictionary, "Radical". Tersedia di sini.
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An Indonesian, a Batak, a christian. Husband, father, son, brother, normal person. R&D engineer. Graduate of Institut Teknologi Bandung (ST), Technische Universiteit Eindhoven (MSc/ir), and Norwegian University of Science and Technology (PhD). Currently a student at the Norwegian School of Theology. A permanent student at the school of life.