This longitudinal study of 3,578 matriculating freshmen at a midsized public doctoral university in the Midwest found that students working on campus academically persisted at higher rates from fall to spring of their first year, and year to year thereafter. Also, students who worked on campus during their first semester in college graduated within six years at higher rates than those who did not.
Beeson, Melisa J. and Wessel, Roger D.
"The Impact of Working on Campus on the Academic Persistence of Freshmen,"
Journal of Student Financial Aid: Vol. 32
, Article 3.
Available at: http://publications.nasfaa.org/jsfa/vol32/iss2/3