The pleasure principle: immersion, engagement, flow. - Yellowlees Douglas; Andrew Hargadon (Hypertext, 2000)

Playing the numbers: M.D. Coverley's Fibonacci's Daughter. - Yellowlees Douglas (SIGWEB Newsl., 2000)

The pleasures of immersion and engagement: schemas, scripts and the fifth business. - Yellowlees Douglas; Andrew Hargadon (Digit. Creativity, 2001)