APA
Lal R, . (1989). Soil physical properties and crop production in the tropics. : International book distributers, Dehradun.
Chicago
Lal R, . 1989. Soil physical properties and crop production in the tropics. : International book distributers, Dehradun.
Harvard
Lal R, . (1989). Soil physical properties and crop production in the tropics. : International book distributers, Dehradun.
MLA
Lal R, . Soil physical properties and crop production in the tropics. : International book distributers, Dehradun. 1989.