1. AgricultureCanada, 1987 : Food production and inspection branch . Description of variety no 2691.
2. AgricultureCanada, 1980 : Food production and inspection branch . Description of variety no 2009.
3. The Fate of Nitrogen Applied to Soils
4. Association desProducteurs d'Engrais duQuebec, 1990 : Guide de fertilisation. 3emeedition.