Gaya APA
Young, G, G., Zarkasyi, I.
(1994).
Usuluddin (aqaid)
.
Ponorogo:
Trimurti Press.
Gaya MLA
Young, Gregory, G.., Zarkasyi, Imam.
"Usuluddin (aqaid)".
Ponorogo:
Trimurti Press,
1994.
Text.