Patanjali's Yoga Sutra
This page has two PDF versions of the Yoga Sutras and a text about the History of Yoga. They’re all definitely worth checking out, but I’d suggest going through them in the order they’re listed for a smoother read.
It doesn't matter which of the two Yoga Sutra versions you choose, as any difference in perspective adds richness to our discussions!
Patanjali Yoga Sutra
PATANJALI'S YOGA SUTRAS
Patanjali's Yoga Sutras with the Commentary of Vyasa - more correctly named Pātañjala-Yoga-Śāstra. The sutras and Vyasa's commentary should be considered a unified work from a single author.
THE SCIENCE OF YOGA
I. K. Taimni's book is meant to give to the serious student of Yoga a clear idea with regard to the fundamental teachings of Yoga in a language which they can understand
History of Yoga
Roots of Yoga
Roots of Yoga is a 2017 book of commentary and translations from over 100 ancient and medieval yoga texts, mainly written in Sanskrit but including several other languages, many not previously published, about the origins of yoga including practices such as āsana, mantra, and meditation