Gaya APA
Pennington, M, O. (1982).
Centering prayer. Renewing an ancient Christian prayer form, repr. .
Garden City:
Image Books.
Gaya MLA
Pennington, M.Basil,, O.C.S.O..
"Centering prayer. Renewing an ancient Christian prayer form, repr. ".
Garden City:
Image Books,
1982.
Buku.