Answered By: Leecy Barnett
Last Updated: Jun 08, 2016     Views: 313

Assumming you are doing APA style here is the answer from the APA blog:

Specifically, this post addresses how to cite multiple articles by the same authors that were published in the same year so that everyone can easily tell them apart.

A Solution for Identical Twins

In essence, the solution to the reference twin problem is not much different from how twins are told apart at birth: Just as twins are referred to as “Baby A” and “Baby B,” “twin references” are also given letters to tell them apart. Specifically, lowercase letters are added after the year (2011a, 2011b, etc.), and the references are alphabetized by title to determine which is “a” and which is “b.” Here is an example:

Koriat, A. (2008a). Easy comes, easy goes? The link between learning and remembering and its exploitation in metacognition. Memory & Cognition, 36, 416–428. doi:10.3758/MC.36.2.416
Koriat, A. (2008b). Subjective confidence in one’s answers: The consensuality principle. Journal of Experimental Psychology: Learning, Memory, and Cognition, 34, 945–959. doi:10.1037/0278-7393.34.4.945

In the text, citations would be styled as follows: (Koriat, 2008a) and (Koriat, 2008b).

So yours would be:

Siddiqi, N. (2013a). Developing cash...        In text:  (Siddiqi, 2013a)

Siddiqi, N. (2013b). Financial information...        In text:  (Siddiqi, 2013b)

From:

Lee, C. (2011, Oct.20). Reference twins: Or, how to cite articles with the same authors and

     same year.  Retrieved from APA Style Blog, American Psychological Association website:

     http://blog.apastyle.org/apastyle/2011/10/reference-twins.html

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