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The EndNote APA 6th referencing style inserts an author's name or initials in in-text citations to distinguish between otherwise ambiguous references, such as two authors with the same surname. For example:
In moderate weather conditions, fire intensity in box ironbark forests might be related to the fuel load (V. R. Brown, 2002), but there are many other factors that need to be considered (Brown & Scott, 2002).
This may be caused by inconsistent data entry, eg. Smith, John J. vs Smith, J. J. and EndNote attributes the references to different authors. The EndNote APA 6th referencing style then distinguishes between ambiguous authors, by including initials in the in-text citations. Extra spaces after an author's name will have the same affect.
Checking your EndNote library for all occurrences of an author's name to make sure they are identical will normally resolve this problem. But if you do not want initials to appear, even for different authors with the same surname, you can modify the referencing style to remove all initials in citations in the text.
In Microsoft Word, you will need to use the option to Update Citations & Bibliography to format the in-text citations in your document using the modified output.
The DOI (Digital Object Identifier) is a unique alphanumeric string assigned by a registration agency http://www.doi.org/ to identify content and provide electronic journal articles and other documents with a persistent link to its location.
The APA 6th referencing style in EndNote displays the DOI where it has been included in an EndNote record.
Example of journal article with DOI in APA 6th style:
Chris, G., & Forbes, G. (2011). An evaluation of second-generation eBook readers. Electronic Library, The, 29(3), 303-319. doi:10.1108/02640471111141061