APA
Singh P. P. &. O., . (1979). Modern chemistry. Bombay: Kitab Mahal.
Chicago
Singh P P & Others, . 1979. Modern chemistry. Bombay: Kitab Mahal.
Harvard
Singh P. P. &. O., . (1979). Modern chemistry. Bombay: Kitab Mahal.
MLA
Singh P P & Others, . Modern chemistry. Bombay: Kitab Mahal. 1979.