Mujeeb, A., Iqbal, M. Z., Shafiq, M., Kabir, M., & Farooqi, Z.- ur-R. (2019). Effects of Nickel Toxicity on Seedling Growth, Photosynthetic Pigments, Carotenoids and Phenols Contents of Cowpea Vigna unguiculata (L.). International Journal of Environment, Agriculture and Biotechnology, 4(2). https://journal-repository.com/index.php/ijeab/article/view/496