Sonnessa, A. J. (1974). Thanmathra spectroscopikku oru mughavura. State institute of languages.
Chicago Edition CitationSonnessa, Antony J. Thanmathra Spectroscopikku Oru Mughavura. Trivandrum: State institute of languages, 1974.
MLA Edition CitationSonnessa, Antony J. Thanmathra Spectroscopikku Oru Mughavura. State institute of languages, 1974.
Warning: These citations may not always be 100% accurate.