Gaya APA

OP, P, G, L. (1977). The three ways of the spiritual life a brief outline of the main principles of ascetical and mystical theology . : tan books.

Gaya MLA

OP, Pere, Garrigou, Lagrange,. "The three ways of the spiritual life a brief outline of the main principles of ascetical and mystical theology". : tan books, 1977. Text.