Chris Ryan (1AD) Agent 21: Reloaded: Book 2. Red Fox. Available at: http://www.amazon.co.uk/Agent-21-Reloaded-Book-2/dp/1849410089/ref=pd_bxgy_14_img_2?ie=UTF8&refRID=16PDQ4SCTHYZMAXNJNDF.
Chris Ryan (6AD) Agent 21: Book 1. Red Fox. Available at: http://www.amazon.co.uk/gp/product/1849410070/ref=s9_simh_gw_p14_d0_i5?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=desktop-1&pf_rd_r=1ZEZRBJ1W8XV0XVHE3NP&pf_rd_t=36701&pf_rd_p=867551787&pf_rd_i=desktop.