Rezka Hadi Prayoga, Alan Julian Duta, & Nurhana Dhea Parlina. (2025). Earnings Management: The Impact of Cost of Goods Sold Increase on Gross Profit Decline (A Study on Waskita Karya (Persero) Tbk for the Period 2015-2023): Pengaruh Kenaikan Harga Pokok Penjualan Terhadap Penurunan Laba Kotor. International Journal Of Humanities Education and Social Sciences (IJHESS), 5(1). https://doi.org/10.55227/ijhess.v5i1.1821