Workers can just move and find jobs on their own, but it's very difficult to secure residency and a work visa in many European countries, says Ms. Berdan.

WSJ: Younger Workers Can Jumpstart Careers by Taking Jobs Abroad

Stacie Nevadomski Berdan, co-author of the book, Get Ahead By Going Abroad, found similarly strong results when she and her co-author, Perry Yeatman, conducted research for their book.

FORBES: How Women Can Accelerate Their Careers By Working Overseas