Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
Originally published in 1958 and authored by one of the foremost liberal Catholic theologians of the 20th Century, this book recognizes the need for a greater unity of understanding among all faiths and explores these common grounds with insight and sympathy.