1. Allison, P. (2002). Missing data. Thousand Oaks, CA: Sage.
2. Allison, P. (2012). Handling missing data by maximum likelihood. Retrieved from http://statisticalhorizons.com/wp-content/uploads/MissingDataByML.pdf .
3. Allport, G. W. (1954/1988). The nature of prejudice. Reading, MA: Addison-Wesley.
4. American Atheists. (2014). What is atheism? Retrieved from http://www.atheists.org/activism/resources/what-is-atheism .
5. Association of American Colleges and Universities. (2013). Diversity in higher education remains an essential national priority [public statement]. Retrieved from http://www.aacu.org/about/statements/documents/DiversityHigherEdStatement30June13.pdf .