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Author details : Vitryani Tarigan
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Author details : Saut Managam Samosir ,Elfina Okto Posmaida Damanik
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Author details : Tumpak Mangoloi Saragih ,Djuli syafe’i Purba
Author details : Wahyu Wiranda ,Vitryani Tarigan
Author details : Centain Sihombing ,Elfina Okto Posmaida Damanik ,Eva Sriwiyanti
Author details : Wico J Tarigan
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Author details : Muftah A. Otman