APA (7th ed.) Citation

Shannon, D. A. (1977). Twentieth century America / by D.A. Shannon (4th ed.). Rand McNally.

Chicago Style (17th ed.) Citation

Shannon, D. A. Twentieth Century America / by D.A. Shannon. 4th ed. Rand McNally, 1977.

MLA (9th ed.) Citation

Shannon, D. A. Twentieth Century America / by D.A. Shannon. 4th ed. Rand McNally, 1977.

Warning: These citations may not always be 100% accurate.