Vishwanatha Ayyer N E. (1988). Prashasanik patravyavahar. Swathi Prakashan.
Chicago Edition CitationVishwanatha Ayyer N E. Prashasanik Patravyavahar. Thiruvananthapuram: Swathi Prakashan, 1988.
MLA Edition CitationVishwanatha Ayyer N E. Prashasanik Patravyavahar. Swathi Prakashan, 1988.
Warning: These citations may not always be 100% accurate.