Gaya APA

Rao, D, B., , . (2011). International encyclopaedia of science and technology education volume 9 . Delhi: Delhi : Mehra pffset press 2011.

Gaya MLA

Rao, Digumarti, Bhaskara., , . "International encyclopaedia of science and technology education volume 9". Delhi: Delhi : Mehra pffset press 2011, 2011. .