Bahskara Rao, D. (1989). Objectives of Science. Science Promoter, 2.
Bhaskara Rao, D., Sundara Rao, G. and Raja Mohan Rao, S. (1986). Scientific Attitudes of Experienced Science Teachers at Secondary School Level. The Educational Review XCII.
Alpern Moris L. The Ability To Test Hypothesis, 1946, 220-229