Gaya APA
O.P., J, G. (1967).
An existential approach to theology, [2nd pr.]. Tjet.pertama, 1966. .
Milwaukee:
Bruce.
Gaya MLA
O.P., Jansen., G.M.A.,.
"An existential approach to theology, [2nd pr.]. Tjet.pertama, 1966. ".
Milwaukee:
Bruce,
1967.
Buku.