Gaya APA
Balthasar, H, U, V. (-1979).
Heart of the world, transl.by Erasmo S.Leiva. : Das Herz der Welt, 1954. .
San Francisco:
Ignatius Press.
Gaya MLA
Balthasar, Hans, Urs, Von.
"Heart of the world, transl.by Erasmo S.Leiva. : Das Herz der Welt, 1954. ".
San Francisco:
Ignatius Press,
-1979.
Buku.