APA
Singh P P & others, . (1991). Modern chemistry std XI. Bombay: Himalaya Pub.
Chicago
Singh P P & others, . 1991. Modern chemistry std XI. Bombay: Himalaya Pub.
Harvard
Singh P P & others, . (1991). Modern chemistry std XI. Bombay: Himalaya Pub.
MLA
Singh P P & others, . Modern chemistry std XI. Bombay: Himalaya Pub. 1991.