Lumban Gaol, Chandra Erick Manaek Pandapotan. “THE INNER LEDGER (UNSHAKEABLE WEALTH) ”. Penamuda Media 2, no. 2 (October 9, 2025): xiv + 264 . Accessed February 2, 2026. https://penamudamedia.com/index.php/publisher/article/view/504.