Menon, P. R. (1980). Pre Degree Trigonamiti (2nd ed.). State Institute of Languages.
Chicago Edition CitationMenon, P Ramachandra. Pre Degree Trigonamiti. 2nd ed. Trivandrum: State Institute of Languages, 1980.
Deismireacht MLAMenon, P Ramachandra. Pre Degree Trigonamiti. 2nd ed. State Institute of Languages, 1980.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.