1. American Heritage® Dictionary of the English Language. (2011). TheFreeDictionary. Accessed May 9, 2016. http://www.thefreedictionary.com/marginal
2. American Heritage® Dictionary of the English Language, Fifth Edition. S.v. “marginality.” (2011). Accessed May 9, 2016. http://www.thefreedictionary.com/marginality
3. Collins English Dictionary—Complete and Unabridged. (2014). TheFreeDictionary. Accessed May 9, 2016. http://www.thefreedictionary.com/marginal
4. Dery, S., Leimgruber, W., & Zsilincsar, W. (2012). Understanding marginality: Recent insights from a geographical perspective. Hrvatski geografski glasnik, 74(1), 5–18.
5. Dictionary of Unfamiliar Words by Diagram Group. (2008). TheFreeDictionary. Accessed May 11, 2016. http://www.thefreedictionary.com/marginal