The Vedanta-Sutras (SBE 48)

Translated by George Thibaut, Sacred Books of the East, vol. 48, with commentary by Ramanuja (1904).

The Vedanta-Sutras Part I (SBE 34)
Translated by George Thibaut, Sacred Books of the East, vol. 34, with commentary by Sankarakarya (1890).

The Vedanta-Sutras Part II (SBE 38)
Translated by George Thibaut, Sacred Books of the East, vol. 38, with commentary by Sankarakarya (1896).

The Crest-Jewel of Wisdom
Translation and commentaries by Charles Johnston, and other writings of Sankaracharya (1946).

Brahma-Knowledge
Short exposition of the Hindu Vedanta philosophy, by L.D. Barnett (1911).

Select Works of Sri Sankaracharya
Selection of works by the non-dualist Vedanta philosopher, translated by S. Venkataramanan (1921).

Related Recommended Reading:

Vedas

The Hindu Epics

Upanishads

Puranas

Other Primary Hindu Texts

Later Hindu Texts

Modern Hindu Books