Boyer, P. S., Clifford, C. E., Kett, J. F., Salisbury, N., Sitkoff, H., & Woloch, N. (2008). The Enduring vision: A history of the American people (6th.). Boston: Houghton Mifflin.

Boyer, Paul S., Clark E. Clifford, Joseph F. Kett, Neal Salisbury, Harvard Sitkoff, and Nancy Woloch. The Enduring Vision: A History of the American People. 6th. Boston: Houghton Mifflin, 2008.

Boyer, Paul S., et al. The Enduring Vision: A History of the American People. 6th. Boston: Houghton Mifflin, 2008.