1. The definition of doping and the proof of a doping offence;Vieweg;Int Sports Law J,2002
2. Use of dietary supplements among professional athletes in Saudi Arabia;Aljaloud;J Nutr Metab,2013
3. Nutritional supplements and doping;Pipe;Clin J Sport Med,2002
4. The use of dietary supplements by athletes;Maughan;J Sports Sci,2007
5. Prevalence of caffeine use in elite athletes following its removal from the world anti-doping agency list of banned substances;Del;Appl Physiol Nutr Metab,2011