Gaya APA
Lewis, C.
(1955).
The Screwtape letters. -Fontana books, 49R Penerbitan asli 1942.
.
[London]:
Collins.
Gaya MLA
Lewis, C.S..
"The Screwtape letters. -Fontana books, 49R Penerbitan asli 1942. ".
[London]:
Collins,
1955.
Buku.