Não informado. West Virginia Agriculture and Forestry. University of West Virginia, College of Agriculture and Forestry.
Citação do estilo Chicago (17ª ed.)Não informado. West Virginia Agriculture and Forestry. Morgantown, Wa. Va: University of West Virginia, College of Agriculture and Forestry.
Citação MLA (8ª ed.)Não informado. West Virginia Agriculture and Forestry. University of West Virginia, College of Agriculture and Forestry.
Atenció: Aquestes cites poden no estar 100% correctes.