APA

Timmer A. S., Williamson J. G., .Immigration policy prior to the 1930s : Labor markets, policy interactions, and globalization backlash. : .

Chicago

Timmer A S, Williamson J G, .Immigration policy prior to the 1930s : Labor markets, policy interactions, and globalization backlash. : .

Harvard

Timmer A. S., Williamson J. G., .Immigration policy prior to the 1930s : Labor markets, policy interactions, and globalization backlash. : .

MLA

Timmer A S, Williamson J G, .: . .