Krizek, K. J., & Levinson, D. M. (2005). Access to destinations. Emerald Group Publishing Limited.
Chicago Style aipamenaKrizek, Kevin J., and David M. Levinson. Access to Destinations. Bingley, United Kingdom: Emerald Group Publishing Limited, 2005.
MLA aipamenaKrizek, Kevin J., and David M. Levinson. Access to Destinations. Emerald Group Publishing Limited, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.