APA
                B.R. Mamatha, B. Shivaraj Department of Agronomy, . (1990). Influence of levels of fertilizer nitrogen, phosphorus and sulphur on growth and yield attributes of niger (Guizotia abyssinica. Bangalore: Universityof Agricultural Sciences, Bangalore.
                
                Chicago
                B.R. Mamatha, B. Shivaraj Department of Agronomy, . 1990. Influence of levels of fertilizer nitrogen, phosphorus and sulphur on growth and yield attributes of niger (Guizotia abyssinica. Bangalore: Universityof Agricultural Sciences, Bangalore.
                
                Harvard
                B.R. Mamatha, B. Shivaraj Department of Agronomy, . (1990). Influence of levels of fertilizer nitrogen, phosphorus and sulphur on growth and yield attributes of niger (Guizotia abyssinica. Bangalore: Universityof Agricultural Sciences, Bangalore.
                
                MLA
                B.R. Mamatha, B. Shivaraj Department of Agronomy, . Influence of levels of fertilizer nitrogen, phosphorus and sulphur on growth and yield attributes of niger (Guizotia abyssinica. Bangalore: Universityof Agricultural Sciences, Bangalore. 1990.