Gray, A., Fernald, M. L., & Rollins, R. C. (1988). Gray's Manual of botany: A handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada (Reprint of the eighth (Centennial) edition, illustrations.). Dioscorides Press.
Citazione stile Chigago Style (17a edizione)Gray, Asa, Merritt Lyndon Fernald, e Reed C. Rollins. Gray's Manual of Botany: A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and Adjacent Canada. Reprint of the eighth (Centennial) edition, illustrations. Portland, OR: Dioscorides Press, 1988.
Citatione MLA (9a ed.)Gray, Asa, et al. Gray's Manual of Botany: A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and Adjacent Canada. Reprint of the eighth (Centennial) edition, illustrations. Dioscorides Press, 1988.