Ramakrishnayyar, R. (1974). Polytechnique bhautikam. Institute of languages.
Dyfyniad Arddull ChicagoRamakrishnayyar, R. Polytechnique Bhautikam. Tvm: Institute of languages, 1974.
Dyfyniad MLARamakrishnayyar, R. Polytechnique Bhautikam. Institute of languages, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.