http://books.google.ca/books?id=hnBoneACQV0C&dq=free+energy+device+handbook&printsec=frontcover&source=bl&ots=-1AXWYCzxB&sig=BYY88EMsGPtLlhuvUApuzjC95ak&hl=en&ei=1KXHSe6MIsKktgfYkuzKCg&sa=X&oi=book_result&resnum=4&ct=result
http://books.google.ca/books?id=hrS_5o60YAMC&dq=tapping+the+zeropoint+energy&printsec=frontcover&source=bl&ots=IO7WYVcXNu&sig=KG3wka6l_II2ZfE4chW5jsTsQ-g&hl=en&ei=J6fHSanfOc-Etwef0u3ICg&sa=X&oi=book_result&resnum=2&ct=result
http://books.google.com/books?q=zero+point+energy
http://www.zpenergy.com/modules.php?name=Topics
http://books.google.com/books?id=8TjqHAAACAAJ&dq=advanced+space+propulsion
http://www.amazon.com/Advanced-Propulsion-Systems-Martin-Tajmar/dp/3211838627/ref=sr_1_1?ie=UTF8&s=books&qid=1237821397&sr=8-1
http://books.google.com/books?q=antigravity
http://books.google.com/books?q=free+energy