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APA (6th ed.) referencing guide (Online): More than one work cited

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In text citations

If you cite two or more works within the same parentheses they should be in alphabetical order of author. 

Example:

...(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.

Example:

...(Davies, 2008, 2010, 2012).

Reference list

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