1. FIVB (2000). Official volleyball rules 2001-2004. FIVB: Seville, Spain.
2. Meier, M. (1989). Formations for covering of spikes. In Volleyball. Fundamentals and principles (edited by Andresen, R. and Kroger, C.), pp. 56–59. Ahrensburg: Czwalina.
3. Papageorgiou, A. and Spitzley, W. (2003). Handbook for Competitive Volleyball. Oxford: Meyer und Meyer.
4. Scates, A. E. (1976). Winning volleyball. Boston: Allyn and Bacon.