Puthenpurakal, J. (2000). Bishop Orestes Marengo, SDB: North East India's unparalleled missionary. Vendrame Institute Publications.
Chicago-viite (17. p.)Puthenpurakal, Joseph. Bishop Orestes Marengo, SDB: North East India's Unparalleled Missionary. Shillong, India: Vendrame Institute Publications, 2000.
MLA-viite (8. p.)Puthenpurakal, Joseph. Bishop Orestes Marengo, SDB: North East India's Unparalleled Missionary. Vendrame Institute Publications, 2000.
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