<ref>{{cite journal|last=German|first=Tim, T. P.|coauthors=Margaret, Anne& Defeyter|title=, M. A. (2000). Immunity to functional fixedness in young children|journal=. ''Psychonomic Bulletin & Review|year=2000|volume='', ''7|issue=''(4|pages=), 707-712|url=. Retrieved from http://search.ebscohost.com.ezproxy.biola.edu/login.aspx?direct=true&db=psyh&AN=2001-14334-015&login.asp&site=ehost-live|accessdate=25 February 2012}}</ref>