I recently started a two-year course on yoga therapy on the university here, and during the first seminar with Yogacharia Mukund V. Bhole we've been shown a couple of editions of
HathaPradipika, Gheranda Samhita and Patanjali's Yoga Sutras
the particular authors of which I didn't notice exactly.
So now I'm supposed to complement my library with some good quality editions of these works.