RT Book T1 Beating the system: [hackers, phreakers and electronic spies; the inside story of Edward Singh and the electronic underworld] A1 Bowcott, Owen A1 Hamilton, Sally LA English PP London PB Bloomsbury YR 1990 ED 1. publ. UL https://krimdok.uni-tuebingen.de/Record/1651371555 SN 0747505136