APA
Kumar P. S. R., . (1990). Practical guide to DDC 20. Nagpur: Dattsons Publishers.
Chicago
Kumar P S R, . 1990. Practical guide to DDC 20. Nagpur: Dattsons Publishers.
Harvard
Kumar P. S. R., . (1990). Practical guide to DDC 20. Nagpur: Dattsons Publishers.
MLA
Kumar P S R, . Practical guide to DDC 20. Nagpur: Dattsons Publishers. 1990.