United States Geological Survey. Soil survey manual. United States Department of Agriculture. Handbook Number 18. Arnold, R.W. and T.J. Roach.
Soils study for potential grape production areas.
Thesis Cornell University. Avissar, R. and Y. Mahrer. Becker, H, Mapping of soils and climate in the Rheingau. Proceedings of the Second Cool Climate Viticulture and Oenology symposium. Auckland, New Zealand.