1. Belastung und Kraftstoffverbrauch der Motoren in der Landwirtschaft;Seifert,1950
2. An investigation into the fuel consumption and use of diesel tractors on eight Berkshire farms;Upton;Journal of agricultural Engineering Research,1961
3. Wheeled and tracklaying tractors-utilization, performance and tyre and track costs;Rutherford,1973
4. Use and loading of tractor on farm;Oksanen,1973
5. Einsatzdaten größerer Ackerschlepper—Ergebnisse einer;Auernhammer;Landtechnik,1983