Directive leadership style of vocational high school principals von Sitanggang, Nathanael, Luthan, Putri Lynna A., Hamid K., Abdul

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Reinventing Formulas for Construction Project Delay Index Due to Management and Production von Luthan, Putri Lynna A., Sitanggang, Nathanael, Syafriandi, Syafriandi

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Leaders' Organizational Communication in Overcoming Conflict von Octaviany, Rini Ade, Lubis, Djoharis, Sitanggang, Nathanael

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The System Approach for Entrepreneurship-Based School Management in Vocational High Schools von Kisno, Kisno, Milfayetty, Sri, Sitanggang, Nathanael, Lubis, Mohammad Joharis

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Interest in Students' Entrepreneurship Building Engineering Education Program von Luthan, Putri Lynna Adelinna, Sitanggang, Nathanael, Sibarani, Choms Gary Ganda Tua

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Supervision Indicator of Formwork on Reinforced Concrete von Luthan, Putri Lynna A., Sitanggang, Nathanael

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Relationship between Total Personal Quality, Service Quality and Student Satisfaction on Higher Education System von Sitanggang, Nathanael, Luthan, Putri Lynna Adelinna, Hamid K, Abdul

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The effects of emotional knowledge, emotional reconciliation, emotional authenticity on the students’ emotional spirituality von Sitanggang, Nathanael, Luthan, Putri Lynna A.

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The Effect of Google SketchUp and Need for Achievement on the Students’ Learning Achievement of Building Interior Design von Sitanggang, Nathanael, Luthan, Putri Lynna Adelinna, Dwiyanto, Felix Andika

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Total Personal Quality of University Students in Medan, Indonesia von Sitanggang, Nathanael, Luthan, Putri Lynna A., K., Abdul Hamid

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Leaders' Organizational Communication in Overcoming Conflict von Rini Ade Octaviany, Djoharis Lubis, Nathanael Sitanggang

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The Effect of Using Real-Object Media on the Students’ Interest in Cost Estimation Learning von Sitanggang, Nathanael, Luthan, Putri Lynna Adelinna, Jeumpa, Kemala, Ma, Hongbo

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Key Factors In Character Education von Agnes Renostini Harefa, Nathanael Sitanggang

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Project-Based Learning Governance on Natural Materials Improving the Creativity of Class VIII Students of SMP Negeri 1 Sigumpar von Siagian, Roy, Nathanael Sitanggang, M. Joharis Lubis

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