1. World Anti-Doping Agency (WADA) 2011 Laboratory Testing Figures Overview of Results http://www.wada-ama.org/Documents/Resources/Testing-Figures/WADA-2011-Laboratory-Testing-Figures.pdf
2. World Anti-Doping Agency (WADA) Technical Document TD2004EAAS. Reporting and Evaluation Guidance for Testosterone, Epitestosterone, T/E Ratio and other Endogenous Steroids http://www.wada-ama.org/Documents/World_Anti-Doping_Program/WADP-IS-Laboratories/Technical_Documents/WADA_TD2004EAAS_Reporting_Evaluation_Testosterone_Epitestosterone_TE_Ratio_EN.pdf
3. Issues in detecting abuse of xenobiotic anabolic steroids and testosterone by analysis of athletes' urine;Catlin;Clin. Chem.,1997