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Conee, Earl Brink 1950-, Riddles of existence [electronic resource] : a guided tour of metaphysics. 2005 [Online]. Available: http://findit.bham.ac.uk/primo_library/libweb/action/display.do?tabs=detailsTab&ct=display&fn=search&doc=44BIR_PDA1_DSebr10194211&indx=2&recIds=44BIR_PDA1_DSebr10194211&recIdxs=1&elementId=1&renderMode=poppedOut&displayMode=full&frbrVersion=&frbg=&&dscnt=0&scp.scps=scope%3A%2844BIR_PDA1_DS%29%2Cscope%3A%2844BIR_ETH1_DS%29%2Cscope%3A%2844BIR_LGUI_DS%29%2Cscope%3A%2844BIR_PURE_FT%29%2Cscope%3A%2844BIR_ALEPH_DS%29%2Cscope%3A%2844BIR_MIM_DS+%29%2Cscope%3A%2844BIR_RLIST_DS%29%2Cscope%3A%2844BIR_ML_DS%29%2Cscope%3A%2844BIR_SFX_DS%29%2Cscope%3A%2844BIR_DR1_DS%29%2Cscope%3A%2844BIR_DR2_DS%29%2C44BIR_Ebsco_1%2Cprimo_central_multiple_fe&mode=Basic&vid=44BIR_VU1&srt=rank&tab=local&vl(freeText0)=riddles%20of%20existence&dum=true&dstmp=1505297810314
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Earl Conee , and  Theodore Sider, Riddles of Existence : A Guided Tour of Metaphysics: New Edition. OUP Oxford, 2014 [Online]. Available: https://ebookcentral.proquest.com/lib/oasispreview/reader.action?docID=1794211
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R. Shafer-Landau, Ethical theory: an anthology, 2nd ed., vol. 17. Chichester, West Sussex: Wiley-Blackwell, 2013 [Online]. Available: http://sfxeu07.hosted.exlibrisgroup.com/bham?isbn=9781280878435%20