Gaya APA
Green, T, H, S. (1981).
Opening to God, a guide to prayer, 3rd pr. Cet.pertama 1977. .
Manila:
StPaul Publications.
Gaya MLA
Green, Thomas, H.,, SJ..
"Opening to God, a guide to prayer, 3rd pr. Cet.pertama 1977. ".
Manila:
StPaul Publications,
1981.
Buku.