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L. D. Febrianto and M. Mulkan, “ÙØ¹Ø§Ù„ÙŠØ© Ø·Ø±ÙŠÙ‚Ø© Ø§Ù„ØÙØ± (drill) Ø¹Ù„Ù‰ Ø§Ø³ØªÙŠØ¹Ø§Ø¨ Ø§Ù„Ù…ÙØ±Ø¯Ø§Øª ÙÙŠ Ù…Ø§Ø¯Ø© Ø§Ù„Ù„ØºØ© Ø§Ù„Ø¹Ø±Ø¨ÙŠØ© Ù„Ù„ØªÙ„Ø§Ù…ÙŠØ° ÙÙŠ Ø§Ù„ØµÙ Ø§Ù„Ø³Ø§Ø¨Ø¹ Ø¨Ù…Ø¯Ø±Ø³Ø© Ø§Ù„Ù…ØªÙˆØ³Ø·Ø© Ø§Ù„Ø¥Ø³Ù„Ø§Ù…ÙŠØ© Ø§Ù„Ù…ØªÙƒØ§Ù…Ù„Ø© Ø±Ø¨Ø§Ù†ÙŠ ÙƒÙ†Ø¯Ø§Ù„ ÙÙŠ Ø§Ù„Ø³Ù†Ø© Ø§Ù„Ø¯Ø±Ø§Ø³ÙŠØ© Ù¢Ù Ù¡Û¹/Ù¢Ù Ù¡Ù¨”, JPPBA, vol. 3, no. 2, pp. 17-35, Nov. 2021.