Degri, M., M. Yusuf, and N. Bukar. “Impact of Weeding Frequency in Controlling Flea Beetles (Podagrica spp.) and Yield of Three Varieties of Okra (Abelmoschus Esculentus L. Moench) in Gombe State, Nigeria”. Archives of Agriculture and Environmental Science, vol. 2, no. 3, Sept. 2017, pp. 181-6, https://journals.aesacademy.org/index.php/aaes/article/view/02-03-09.