1. Barnes, P. (2000). The development of values in outdoor education. In P. Barnes (Ed.), Values and outdoor learning (pp. 20–25). Penrith, UK: AfOL.
2. Barnes, P. (2001). Why do centre staff do the things they do? — The Multi-Layered Motivation Model. Horizons, 15, 30–31.
3. Barnes, P. (2002). Outdoor leaders as cultural phenomena. In B. Humberstone, B. Brown, & K. Richards (Eds.), Whose journeys? The outdoors and adventure as social and cultural phenomena (pp. 241–252). Penrith, UK: Institute for Outdoor Learning.
4. Barnes, P. (2004). Debate and cliché — a philosophy for outdoor education. In P. Barnes, & B. Sharp (Eds.), The Russell House companion to outdoor education (pp. 8–13). Lyme Regis, UK: Russell House.
5. Barnes, P., & Sharp, B. (2004). Some thoughts on the nature of outdoor education. In P. Barnes & B. Sharp (Eds.), The Russell House companion to outdoor education (pp. 1–5). Lyme Regis, UK: Russell House.