Bhaskaran K. N. P. Y., . (1980). Pre-Degree Zoology Part-I. : .
Bhaskaran K.K Narayana Pillai Yatheesh,S, . 1980. Pre-Degree Zoology Part-I. : .
Bhaskaran K.K Narayana Pillai Yatheesh,S, . Pre-Degree Zoology Part-I. : . 1980.