The Bhagavad Gita (Swami Sivananda, The Divine Life Society, Rishikesh). Available in print and as a free PDF on the DLS website.
The Swami Sivananda Gita is a modern spiritual classic. It is arguably one of the best practical English commentaries on the Gita for living an integrated, dharmic life. If you want to apply the Gita to your mind and actions rather than just study it intellectually, this is an outstanding choice. swami sivananda gita