Primary
- Varthamana Pusthakam. [Malayalam.] Kottayam: Oriental Institute of Relgious Studies in India Publ., 1989. [Cited in P.T. Mathew, "Faith-Culture Encounter in India: Insights from the Letters of Pedro Luis, the First Ever Indian Jesuit." Vidyajyoti Journal of Theological Reflection 77/11 (2013) 850.]