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Harahap, K. A. ØÙƒÙ… Ø§Ù„Ø²ÙˆØ§Ø¬ Ø¨ÙŠÙ† Ø±Ø¶Ø¹Ø§Ø¡ Ø£Ù„Ø¨Ø§Ù† Ø¨Ù†ÙˆÙƒ Ø§Ù„Ù„Ø¨Ù† Ø¹Ù†Ø¯ Ø¹Ù„Ù…Ø§Ø¡ Ø§Ù„ÙÙ‚Ù‡ Ø§Ù„Ø¥Ø³Ù„Ø§Ù…Ù‰: Ø¯Ø±Ø§Ø³Ø© Ù‚ÙÙ‡ÙŠØ© Ù…Ù‚Ø§Ø±Ù†Ø©. JPA 2020, 14, 20-40.