Dyfyniad APA
ebrary, Inc, Faulkner, R. K., Shell, S. M., & Schneider, T. E. (2009). America at risk: Threats to liberal self-government in an age of uncertainty. University of Michigan Press.
Dyfyniad Arddull Chicago
ebrary, Inc, Robert K. Faulkner, Susan Meld Shell, and Thomas E. Schneider. America at Risk: Threats to Liberal Self-government in an Age of Uncertainty. Ann Arbor: University of Michigan Press, 2009.
Dyfyniad MLA
ebrary, Inc, et al. America at Risk: Threats to Liberal Self-government in an Age of Uncertainty. University of Michigan Press, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.