APA

USA, . (19). Costs of producing sugar beets. Washington, DC: Government Printing Office.

Chicago

USA, . 19. Costs of producing sugar beets. Washington, DC: Government Printing Office.

Harvard

USA, . (19). Costs of producing sugar beets. Washington, DC: Government Printing Office.

MLA

USA, . Costs of producing sugar beets. Washington, DC: Government Printing Office. 19.