APA
Pavitar Parkash Singh e., Pavitar Parkash Singh e., . (2006). Biological weapons. New delhi: Deep & deep pub.
Chicago
Pavitar Parkash Singh ed, Pavitar Parkash Singh ed, . 2006. Biological weapons. New delhi: Deep & deep pub.
Harvard
Pavitar Parkash Singh e., Pavitar Parkash Singh e., . (2006). Biological weapons. New delhi: Deep & deep pub.
MLA
Pavitar Parkash Singh ed, Pavitar Parkash Singh ed, . Biological weapons. New delhi: Deep & deep pub. 2006.