APA

Bu-Ci, . (1970). The United States Encyclopedia Of History V-4. : .

Chicago

Bu-Ci, . 1970. The United States Encyclopedia Of History V-4. : .

Harvard

Bu-Ci, . (1970). The United States Encyclopedia Of History V-4. : .

MLA

Bu-Ci, . The United States Encyclopedia Of History V-4. : . 1970.