Matthys, J. (2015). Who is our mother of perpetual help? (First edition.). Liguori.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMatthys, John. Who Is Our Mother of Perpetual Help? First edition. Liguori, MO: Liguori, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMatthys, John. Who Is Our Mother of Perpetual Help? First edition. Liguori, 2015.
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