Dyfyniad APA

Bardes, B. A., Shelley, M. C., & Schmidt, S. W. (1990). American government and politics today: The essentials (3rd ed.). West Pub.

Dyfyniad Arddull Chicago

Bardes, Barbara A., Mack C. Shelley, and Steffen W. Schmidt. American Government and Politics Today: The Essentials. 3rd ed. St. Paul, MN: West Pub, 1990.

Dyfyniad MLA

Bardes, Barbara A., et al. American Government and Politics Today: The Essentials. 3rd ed. West Pub, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.