HG Wells, Rudy Rucker, Colin Wilson (2013). “The Last Books of H.G. Wells: The Happy Turning: A Dream of Life & Mind at the End of its Tether”, p.25, Monkfish Book Publishing
"Credo". Essay by Arthur C. Clarke (1991), later published in Arthur C. Clarke "Greetings, Carbon-Based Bipeds!: Collected Essays, 1934-1998" (p. 360), 1990.