IVP in 1995 published a book by this title: "What About Those Who Have Never Heard?" It is edited by John Sanders, and contains careful presentations and then rebuttals and responses to the others, by three theologians holding contrasting views: Gabriel Fackre presenting Divine Perseverance, Ronald H. Nash presenting Restrictivism, and John Sanders presenting Inclusivism.

This book currently sells at a 20% discount for $10.40 if ordered online. For more information on how to obtain a copy go to InterVarsity Press at: http://www.ivpress.com/cgi-ivpress/book.pl/code=1606