"Daniel J. Levitin Q&A: 'We've created more information in the past few years than in all of human history before us'". Interview with Lisa O'Kelly, www.theguardian.com. January 18, 2015.
"Finding Joy in the Nitty-Gritty: An Interview with Ann Voskamp". "Homeschool Heartbeat" podcast with Mike Farris (Volume 127, Week 14), hslda.org. August 8-12, 2016.
Egon Friedell (1953). “A Cultural History of the Modern Age: Introduction. book 1. Renaissance and reformation, from the black death to the thirty years' war”
Richard Paul Evans (2014). “Richard Paul Evans: The Complete Walk Series eBook Boxed Set: The Walk, Miles to Go, Road to Grace, Step of Faith, Walking on Water”, p.21, Simon and Schuster