Havighurst, W., & Hart, J. F. (1979). Midwest and Great Plains ([Student's edition].). The Fideler Company.
Citazione stile Chigago Style (17a edizione)Havighurst, Walter, e John Fraser Hart. Midwest and Great Plains. [Student's edition]. Grand Rapids, Michigan Toronto, Canada: The Fideler Company, 1979.
Citatione MLA (9a ed.)Havighurst, Walter, e John Fraser Hart. Midwest and Great Plains. [Student's edition]. The Fideler Company, 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.