Ubel PA. (2009). Free market Madness. Harvard Bus. School Pub.
Chicago Style aipamenaUbel PA. Free Market Madness. Boston: Harvard Bus. School Pub, 2009.
MLA aipamenaUbel PA. Free Market Madness. Harvard Bus. School Pub, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.