Sidharthan R. (2005). Book of inventions. Siso books.
Dyfyniad Arddull ChicagoSidharthan R. Book of Inventions. Thiruvananthapuram: Siso books, 2005.
Dyfyniad MLASidharthan R. Book of Inventions. Siso books, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.