https://books.google.fr/books?id=4eq44GVbuhYC&printsec=frontcover&dq=Etienne+Gilson&hl=fr&sa=X&ei=52iQVOjQCofOaNCHgPgE&ved=0CDAQ6AEwAA#v=onepage&q=Etienne%20Gilson&f=false
https://books.google.fr/books?id=5IpiyHC26fIC&printsec=frontcover&dq=Etienne+Gilson&hl=fr&sa=X&ei=52iQVOjQCofOaNCHgPgE&ved=0CFQQ6AEwBg#v=onepage&q=Etienne%20Gilson&f=false
https://books.google.fr/books?id=o6pSBQDqu9kC&printsec=frontcover&dq=Etienne+Gilson&hl=fr&sa=X&ei=52iQVOjQCofOaNCHgPgE&ved=0CFwQ6AEwBw#v=onepage&q=Etienne%20Gilson&f=false
https://books.google.fr/books?id=5IpiyHC26fIC&printsec=frontcover&dq=Etienne+Gilson&hl=fr&sa=X&ei=52iQVOjQCofOaNCHgPgE&ved=0CFQQ6AEwBg#v=onepage&q=Etienne%20Gilson&f=false
https://books.google.fr/books?id=o6pSBQDqu9kC&printsec=frontcover&dq=Etienne+Gilson&hl=fr&sa=X&ei=52iQVOjQCofOaNCHgPgE&ved=0CFwQ6AEwBw#v=onepage&q=Etienne%20Gilson&f=false