If you cite two or more works within the same parentheses they should be in alphabetical order of author.
...(Ashley, Kibbe, & Thornton, 2014; Kwiecinski & Rothschild, 2016).
Arrange two or more works by the same authors (in the same order) by year of publication. Give the authors' last names once; for each subsequent work, give only the date.
...(Davies, 2008, 2010, 2012).
Ashley, C., Kibbe, S., & Thornton, S. (2014). Experiential learning in second Life: A simulation in retail management. Atlantic Marketing Journal, 3(2), 94-113.
Kwiecinski, J., & Rothschild, B. (2016). No rheumatoid arthritis in ancient Egypt: A reappraisal. Rheumatology International, 36, 891-895. doi:10.1007/s00296-015-3405-z