APA
Karthikakuttyamma M, Balan M V & George C M. (1976). Available phosphorus and potassium status of rubber growing soils in relation to manuring of leguminous ground covers. : Rubber Board Bulletin.
Chicago
Karthikakuttyamma M, Balan M V and George C M. 1976. Available phosphorus and potassium status of rubber growing soils in relation to manuring of leguminous ground covers. : Rubber Board Bulletin.
Harvard
Karthikakuttyamma M, Balan M V and George C M. (1976). Available phosphorus and potassium status of rubber growing soils in relation to manuring of leguminous ground covers. : Rubber Board Bulletin.
MLA
Karthikakuttyamma M, Balan M V and George C M. Available phosphorus and potassium status of rubber growing soils in relation to manuring of leguminous ground covers. : Rubber Board Bulletin. 1976.