APA
(1987). Efficiency of nitrogen fertilizers for rice. Laguna: International Rice Research Institute.
Chicago
1987. Efficiency of nitrogen fertilizers for rice. Laguna: International Rice Research Institute.
Harvard
(1987). Efficiency of nitrogen fertilizers for rice. Laguna: International Rice Research Institute.
MLA
Efficiency of nitrogen fertilizers for rice. Laguna: International Rice Research Institute. 1987.
