ELIGIBILITY OF INDONESIAN SUPPLEMENTARY BOOKS FOR GRADE 12 HIGH SCHOOLS/VOCATIONAL SCHOOLS AS SUPPORTING TEXTBOOKS AT SMKN 2 WONOGIRI

As material that has been prepared in the context of learning, main textbook should have feasibility so it is able to carry out tasks world education according field and level book. Likewise with supplementary textbooks. At this time, there will be many supplement books are actually help students educators interacting collaborating today. Quality textbooks become adequate learning materials for more easily reach certain levels Basic Competence. Textbooks make independent substance method. (Puskurbuk, 2012). direct independently access without full educators. The purpose study describe two Indonesian used at SMKN 2 Wonogiri, namely YW book E This research a qualitative descriptive type content analysis sources data form primary secondary data. content, both language books, data, while result interviews teachers student questionnaires class XII as supporting study. Secondary comparison Testing validity using source triangulation. results stated text had linguistic, presentation, graphic feasibility. mentioned above suitable use Wonogiri.