I think the best teacher on Samatha and Vipassana is the core teachings of SN/SA suttas themselves. E.g.:
Vipassana in SN/SA suttas is the practice of ‘right view’ How to get Right View? - #13 by thomaslaw
Samatha in SN/SA suttas is the practice of ‘mindfulness’. See:
Pages 215-8 from The Fundamental Teachings of Early Buddhism Choong Mun-keat 2000.pdf (285.9 KB)
Pages 225-7 from The Fundamental Teachings of Early Buddhism Choong Mun-keat 2000.pdf (210.4 KB)