Anandan, K. N. A., Gangadharan, M. V. A., Kaladharan, T. P. A., Purushothaman, P. V. A., Ramakrishnan, C. A., & Ramesan, K. M. A. (2007). Vidyaabhyaasa parivarthanathinu oraamukham (7th ed.).

Anandan, K N; Author, M V; Author Gangadharan, T P; Author Kaladharan, P V; Author Purushothaman, C; Author Ramakrishnan, a K M; Author Ramesan. Vidyaabhyaasa Parivarthanathinu Oraamukham. 7th ed. Thrissur, Kerala Sastra Sahitya Parishat Ke, 2007.

Anandan, K N; Author, et al. Vidyaabhyaasa Parivarthanathinu Oraamukham. 7th ed. 2007.