3 1 20 a proven formula to open up! and own the room Koegel, Timothy J. Primary Author mixed material 9781929774449 United States Green Leaf Book Group Press 2007 cover_the_exceptional_presenter_a_proven_formula_to_open_up_and_own_the_room.jpg david peoples' proven techniques Peoples, David A. Primary Author mixed material 0471559563 USA John Wiley & Sons, Inc. 1992 cover_presentations_plus_david_peoples_proven_techniques.jpg david peoples' proven techniques Peoples, David A. Primary Author mixed material 0471559563 New York John Wiley & Sons, Inc. 1992 RE_658.45_PEO_p.jpg.jpg