Gunasena, H.P.M., De Silva, N.T.M.H. and Martin, M.P.L.D., 1980. Effect of spacing and nitrogen on growth and yield of manioc, Manihot esculenta Crantz grown as an intercrop under coconut. Journal of the National Science Foundation of Sri Lanka, 8(1), pp.1–10.

Gunasena HPM, De Silva NTMH, Martin MPLD. Effect of spacing and nitrogen on growth and yield of manioc, Manihot esculenta Crantz grown as an intercrop under coconut. Journal of the National Science Foundation of Sri Lanka. 1980;8(1):1–0.

Gunasena, H. P. M., De Silva, N. T. M. H., & Martin, M. P. L. D. (1980). Effect of spacing and nitrogen on growth and yield of manioc, Manihot esculenta Crantz grown as an intercrop under coconut. Journal of the National Science Foundation of Sri Lanka, 8(1), 1–10.

1. Gunasena HPM, De Silva NTMH, Martin MPLD. Effect of spacing and nitrogen on growth and yield of manioc, Manihot esculenta Crantz grown as an intercrop under coconut. Journal of the National Science Foundation of Sri Lanka. 1980;8(1):1-10.

Gunasena HPM, De Silva NTMH and Martin MPLD, ‘Effect of Spacing and Nitrogen on Growth and Yield of Manioc, Manihot Esculenta Crantz Grown as an Intercrop Under Coconut’ (1980) 8 Journal of the National Science Foundation of Sri Lanka 1

Gunasena, H. P. M, N. T. M. H. De Silva, and M. P. L. D. Martin. 1980. “Effect of Spacing and Nitrogen on Growth and Yield of Manioc, Manihot Esculenta Crantz Grown as an Intercrop Under Coconut”. Journal of the National Science Foundation of Sri Lanka 8 (1): 1–10.

Gunasena, H. P. M, N. T. M. H. De Silva, and M. P. L. D. Martin. “Effect of Spacing and Nitrogen on Growth and Yield of Manioc, Manihot Esculenta Crantz Grown as an Intercrop Under Coconut”. Journal of the National Science Foundation of Sri Lanka 8, no. 1 (1980): 1–10.

Gunasena, H P M, et al.. “Effect of spacing and nitrogen on growth and yield of manioc, Manihot esculenta Crantz grown as an intercrop under coconut”. Journal of the National Science Foundation of Sri Lanka, vol. 8, no. 1, 1980, pp. 1–0.