Harvard referencing: same year, same last name, same initials This is a question about the Harvard referencing system. 

I've written a paper and cited two publications, each with a single author, both published in the same year. These authors are unrelated - one is a man and the other is a woman - but they have the same surname and the same two initials. They do have different first and middle names, but neither has a second middle name. So it's as it were Alan Brian Smith, 2012 and Alice Beatrice Smith, 2012.

How do I handle this? I'm guessing my inline citations should be either (Smith, Alice, 2012) or (Smith, 2012a), but can't work out which. Or maybe it's something else. Plus in the bibliography, should they be listed by alphabetical order of author first name? Chronologically? 

Many thanks for any help.
The guidelines to the venue you are submitting to must be your guideline. After all, the title of the paper is what distinguishes one author from the other. And this information is present in the bibliography.

For the in text references, neither University of Leeds nor The University of Melbourne has any suggestion for such situation. However, both use the style (Smith, 2012a) and (Smith, 2012b) for same author, different publications. So, that is not correct.

Personally, I would go with adding a footnote at every page that the citation occurs, maybe with a Google Scholar or personal website page. 
Writing the full name would not be a generic solution as there might be two different authors with same name and same surname.