UMMERKUTTY A., . (2012). SCIENCE OF THE OCEANS. : NATIONAL BOOK TRUST, NEW DELHI.
UMMERKUTTY A.N.P, . 2012. SCIENCE OF THE OCEANS. : NATIONAL BOOK TRUST, NEW DELHI.
UMMERKUTTY A.N.P, . SCIENCE OF THE OCEANS. : NATIONAL BOOK TRUST, NEW DELHI. 2012.