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http://books.google.com/books?id=nsnl3hHPuowC&dq p.359

http://books.google.com/books?id=z7_bgYZat50C&dq p. 52

http://web.mit.edu/krugman/www/formal.html

http://books.google.com/books?id=Ql5hmCZudLMC&dq ch. 11 Marshall on Method

http://www.journals.uchicago.edu/doi/abs/10.1086/380666

http://journals.cambridge.org/action/displayAbstract;jsessionid=72BE5BB6E58AAEAA41B183927991F392.tomcat1?fromPage=online&aid=181597

http://books.google.com/books?id=2XTVP-0WaAgC&dq ch. 1

http://books.google.com/books?id=fFnV_Jg9LJIC&dq p. 113-114

http://www.timeshighereducation.co.uk/story.asp?storyCode=160470&sectioncode=8

http://pqasb.pqarchiver.com/chicagotribune/access/24231437.html?dids=24231437:24231437&FMT=ABS&FMTS=ABS:FT&type=current&date=Jan+30%2C+1994&author=David+Warsh%2C+Boston+Globe.&pub=Chicago+Tribune+%28pre-1997+Fulltext%29&desc=READING+BETWEEN+LINES+OF+LITERARY%2C+MATHEMATICAL+ECONOMICS&pqatl=google

http://cje.oxfordjournals.org/cgi/content/citation/8/4/361

http://www.jstor.org/pss/2975753

http://www.jstor.org/pss/234344

http://www.jstor.org/pss/1826949

http://www.jstor.org/pss/2226235

http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=4306672

http://hope.dukejournals.org/cgi/pdf_extract/39/1/81

http://venus.unive.it/licalzi/EconMatem1469.pdf

http://www.informaworld.com/smpp/ftinterface?content=a713663197&rt=0&format=pdf

http://www.jstor.org/pss/1811410

http://chla.library.cornell.edu/cgi/t/text/pageviewer-idx?c=chla;cc=chla;rgn=full%20text;idno=5033566_4127_001;didno=5033566_4127_001;view=image;seq=156;node=5033566_4127_001%3A4.16;page=root;size=s;frm=frameset;

http://ro.uow.edu.au/commwkpapers/122/

http://books.google.com/books?id=iBOuoKw5UkoC&dq

http://hope.dukejournals.org/cgi/content/citation/37/1/133

http://www.mitpressjournals.org/doi/abs/10.1162/154247603322390937

http://econ.tepper.cmu.edu/barnett/alderson_event.pdf