On behalf of a colleague, I am looking for literature on the naming of the nakṣatras. Also, do we know how it was decided which star (sometimes singular, sometimes plural) was chosen to 'represent' that part of the sky, as it were? 

In some cases, it seems obvious (the Pleiades, for example, are quite striking, even with modern levels of light pollution; and Aldebaran is reddish/rohiṇī indeed); in others less so, hence the search for any systematic studies of this.

With many thanks,

     Antonia