"Census of India, 1991" Economic tables " Vol. 1, Pt. IIIB- B series, Table B-2 (F), B-3 (F), B-6 (F), B-7 (F), B-8 " "Census of India, 1991" - Andhra Pradesh Govt. Press 1991 - "VII, 1031p" cm. Standard No.: 162728 Source: Reference Collections Dewey Class. No.: "Y:5.216sN91, P1.2"