Well, it's generally a technique used to enhance the lighting that's already there or to correct something, so it's not as if there is some standardized set of dodging and burning routines for portraits. It's something that most photographers do intuitively. I don't think it's a topic worthy of a book.

There are more standard retouching techniques like softening facial lines on the neg, spotting out extra catchlights on the print, toning down overly bright highlights, cleaning up the whites of the eyes with local bleaching, and such, because these address more specific issues in formal portraiture than dodging and burning.