Roark, J. L., Johnson, M. P., Cohen, P. C., Stage, S., & Hartmann, S. M. (2014). Understanding the American promise: A history (2. edition, combined.). Bedford/St. Martin's.
Citazione stile Chigago Style (17a edizione)Roark, James L., Michael P. Johnson, Patricia Cline Cohen, Sarah Stage, e Susan M. Hartmann. Understanding the American Promise: A History. 2. edition, combined. Boston, New York: Bedford/St. Martin's, 2014.
Citatione MLA (9a ed.)Roark, James L., et al. Understanding the American Promise: A History. 2. edition, combined. Bedford/St. Martin's, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.