Subbarayalu, Y. (2014). "Book Review: M.G.S. Narayanan, Perumals of Kerala: Brahmin Oligarchy and Ritual Monarchy, Political and Social Conditions of Kerala under the Cera Perumals of Makotai (c. AD 800–1124)". The Indian Economic & Social History Review (SAGE Publications) 51 (3): 399–403. doi:10.1177/0019464614537142.
Gurukkal, Rajan (2014). "Book Review: M.G.S. Narayanan, Perumals of Kerala: Brahmin Oligarchy and Ritual Monarchy—Political and Social Conditions of Kerala Under the Cera Perumals of Makotai (c. AD 800–AD 1124)". Indian Historical Review (SAGE Publications) 41 (1): 103–105. doi:10.1177/0376983614521543.