Barde, Bate Garba, and Yunana Bitrus Duhu. 2020. “Heavy Metals and Petroleum Hydrocarbon Concentration in Water and Periwinkles (Tympanotonus Fuscatus L.) Obtained from Calabar River, Cross River State, Nigeria”. International Journal of Environment, Agriculture and Biotechnology 5 (3). https://journal-repository.com/index.php/ijeab/article/view/2118.