1. From Ketchup to California Cuisine: How the Mechanical Tomato Harvester Prompted Today's Food Movement;Carlisle-Cummins,2015
2. UC Tomato Harvester Designated as Historic Landmark,2005
3. Ray A. Kroc dies at 81. Built McDonald's Chain;Pace;The New York Times,1984
4. The tomato harvester;de la Peña;Boom,2013