Spencer Johnson · 7 obras en el catálogoObrasPPeaks and ValleysPeaks and ValleysPPicos y VallesPicos y VallesVValueTales TreasuryValueTales TreasuryMMi heziz et ha-gevinah sheli?Mi heziz et ha-gevinah sheli?NNew Business IdeasNew Business IdeasWWho Moved My Cheese?Who Moved My Cheese?RRegaʻ le-ʻatsmekhaRegaʻ le-ʻatsmekha