https://books.google.fr/books?id=1QOvJ14Jxv8C&printsec=frontcover&dq=Peter+Green&hl=fr&sa=X&ei=jl6QVKKoEcL1UJy7g6AO&ved=0CDMQ6AEwAQ#v=onepage&q=Peter%20Green&f=false
https://books.google.fr/books?id=AgL4U6EsNW4C&printsec=frontcover&dq=Peter+Green&hl=fr&sa=X&ei=jl6QVKKoEcL1UJy7g6AO&ved=0CDsQ6AEwAg#v=onepage&q=Peter%20Green&f=false
https://books.google.fr/books?id=AgL4U6EsNW4C&printsec=frontcover&dq=Peter+Green&hl=fr&sa=X&ei=jl6QVKKoEcL1UJy7g6AO&ved=0CDsQ6AEwAg#v=onepage&q=Peter%20Green&f=false