Gelp, Michael J. How to think like Leonardo da Vinci : seven steps to genius every day / by Michael J. Gelb - New York: Bantam Dell, 2004. - xvii, 317 p. ; ill. 21 cm. ISBN: 0440508274 Subjects--Topical Terms: Da Vincian Principles Dewey Class. No.: 153 / GEL P04H