APA Citation

Marshall, T. The age of walls: How barriers between nations are changing our world (Sixth edition.).

Chicago Style Citation

Marshall, Tim. The Age of Walls: How Barriers between Nations Are Changing Our World. Sixth edition.

MLA Citation

Marshall, Tim. The Age of Walls: How Barriers between Nations Are Changing Our World. Sixth edition.

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