APA

National Climatic Data Center U.S, . (2000). 1998-1999 tornadoes and a long-term U.S tornado climatology. Asheville, NC: U.S Dep.of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite Data and Information Service, National Climatic Data Center.

Chicago

National Climatic Data Center U.S, . 2000. 1998-1999 tornadoes and a long-term U.S tornado climatology. Asheville, NC: U.S Dep.of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite Data and Information Service, National Climatic Data Center.

Harvard

National Climatic Data Center U.S, . (2000). 1998-1999 tornadoes and a long-term U.S tornado climatology. Asheville, NC: U.S Dep.of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite Data and Information Service, National Climatic Data Center.

MLA

National Climatic Data Center U.S, . 1998-1999 tornadoes and a long-term U.S tornado climatology. Asheville, NC: U.S Dep.of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite Data and Information Service, National Climatic Data Center. 2000.