Dyfyniad APA
ebrary, Inc, Gallman, R. E., & Wallis, J. J. (1992). American economic growth and standards of living before the Civil War. University of Chicago Press.
Dyfyniad Arddull Chicago
ebrary, Inc, Robert E. Gallman, and John Joseph Wallis. American Economic Growth and Standards of Living Before the Civil War. Chicago: University of Chicago Press, 1992.
Dyfyniad MLA
ebrary, Inc, et al. American Economic Growth and Standards of Living Before the Civil War. University of Chicago Press, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.