URL: https://www.reasonablefaith.org/writings/scholarly-writings/the-existence-of-god/the-indispensability-of-theological-meta-ethical-foundations-for-morality/

URL: https://www.apologeticspress.org/rr/reprints/Foundations-of-Morality.pdf

URL: https://www.apologeticspress.org/pdfs/e-books_pdf/cfeog.pdf

URL: https://www.apologeticspress.org/apPubPage.aspx?pub=1&issue=1108

URL: https://www.reasonablefaith.org/writings/scholarly-writings/the-existence-of-god/the-teleological-argument-and-the-anthropic-principle/