APA
United States of America Department of Agriculture f. s. n. C. e. s. s. M., .Black walnut for the future / USDA. minnesota: .
Chicago
United States of America Department of Agriculture forest service north Central experiment station st.paul Minnesota, .Black walnut for the future / USDA. minnesota: .
Harvard
United States of America Department of Agriculture f. s. n. C. e. s. s. M., .Black walnut for the future / USDA. minnesota: .
MLA
United States of America Department of Agriculture forest service north Central experiment station st.paul Minnesota, .minnesota: . .
