Boyer, P. S. (1990). The enduring vision: A history of the American people. Heath.
Citazione stile Chigago Style (17a edizione)Boyer, Paul S. The Enduring Vision: A History of the American People. Lexington, Mass. [u.a.]: Heath, 1990.
Citatione MLA (9a ed.)Boyer, Paul S. The Enduring Vision: A History of the American People. Heath, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.