APA
Leisinger K. M., Pandya-Lorch R. & Schmitt K. M. (2002). Six billion and counting. Washington: International Food Policy Research Institute.
Chicago
Leisinger Klaus M, Pandya-Lorch Rajul and Schmitt Karin M. 2002. Six billion and counting. Washington: International Food Policy Research Institute.
Harvard
Leisinger K. M., Pandya-Lorch R. and Schmitt K. M. (2002). Six billion and counting. Washington: International Food Policy Research Institute.
MLA
Leisinger Klaus M, Pandya-Lorch Rajul and Schmitt Karin M. Six billion and counting. Washington: International Food Policy Research Institute. 2002.