Single volumes:

Christopher Dawson, The Historic Reality of Christian Culture

Gerhard Ebeling: The Problem of Historicity

Daniel P. Fuller: Gospel And Law: Contrast or Continuum?

Peter Gay: Modernism: The Lure of Heresy

Leon Morris, The Apostolic Preaching of the Cross

Francis A. Schaeffer, The Great Evangelical Disaster

Thomas Sowell, A Conflict of Visions 

Richard Tarnas, The Passion of the Western Mind

A. W. Tozer, The Best of A. W. Tozer

Cornelius Van Til, The Defense of the Faith 

Multivolume works by a single author:

E. M. Bounds, The Complete Works of E. M. Bounds on Prayer 

Carl F. H. Henry, God, Revelation, and Authority

Jaroslav Pelikan, The Christian Tradition