Boyer, P. S., Purvis, T. L., Kett, J. F., Woloch, N., Sitkoff, H., & Clark, C. E., Jr. (1990). The enduring vision: A history of the American people, volume1: to 1877. Lexington, Massachusetts: D.C. Heath and Company.

Boyer, Paul S., Thomas L. Purvis, Joseph F. Kett, Nancy Woloch, Harvard Sitkoff, and Clifford E. Clark, Jr. The Enduring Vision: A History of the American People, Volume1: To 1877. Lexington, Massachusetts: D.C. Heath and Company, 1990.

Boyer, Paul S., et al. The Enduring Vision: A History of the American People, Volume1: To 1877. Lexington, Massachusetts: D.C. Heath and Company, 1990.