Gaya APA
St., C, A, G. (1976).
Treatise on purgatory the dialogue, transl.by Charlotte Balfour and Helen Irvine. .
London:
Sheed and Ward.
Gaya MLA
St., Catherina, A, Genua,.
"Treatise on purgatory the dialogue, transl.by Charlotte Balfour and Helen Irvine. ".
London:
Sheed and Ward,
1976.
Buku.