Megaliths at Machad and Pazhayannur, Talppally Taluka, Trichur District, Kerala State : a report of the excavations conducted from 18th April to 12th May 1974 - Mehta, Ramanlal Nagarji (Dept. of Archaeology & Ancient History, Faculty of Arts, M.S. University of Baroda : copies can be had from University Publications Sales Unit, 1978)