Cita APA (7th ed.)
Pauline J Lawrence & Goodhart, D. (1968). Concepts in american history. Cambridge books.
Cita Chicago (17th ed.)
Pauline J Lawrence i David Goodhart. Concepts in American History. New York: Cambridge books, 1968.
Cita MLA (9th ed.)
Pauline J Lawrence i David Goodhart. Concepts in American History. Cambridge books, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.