APA aipamena

Vishwanatha Ayyer N E. (1988). Prashasanik patravyavahar. Swathi Prakashan.

Chicago Style aipamena

Vishwanatha Ayyer N E. Prashasanik Patravyavahar. Thiruvananthapuram: Swathi Prakashan, 1988.

MLA aipamena

Vishwanatha Ayyer N E. Prashasanik Patravyavahar. Swathi Prakashan, 1988.