APA
Yogaratnam N, . (1981). Urea as a source of nitrogen for rubber plantations in Sri Lanka. 1. A review and preliminary observations. : Journal of the Rubber Research Institute of Sri Lanka.
Chicago
Yogaratnam N, . 1981. Urea as a source of nitrogen for rubber plantations in Sri Lanka. 1. A review and preliminary observations. : Journal of the Rubber Research Institute of Sri Lanka.
Harvard
Yogaratnam N, . (1981). Urea as a source of nitrogen for rubber plantations in Sri Lanka. 1. A review and preliminary observations. : Journal of the Rubber Research Institute of Sri Lanka.
MLA
Yogaratnam N, . Urea as a source of nitrogen for rubber plantations in Sri Lanka. 1. A review and preliminary observations. : Journal of the Rubber Research Institute of Sri Lanka. 1981.