APA (7th ed.) Citation

Williams, C. N., Uzo, J. O., & Peregrine, W. T. H. (1991). Vegetable production in the tropics. Longman.

Chicago Style (17th ed.) Citation

Williams, C. N., J. O. Uzo, and W. T. H. Peregrine. Vegetable Production in the Tropics. Burnt Mill, England: Longman, 1991.

MLA (9th ed.) Citation

Williams, C. N., et al. Vegetable Production in the Tropics. Longman, 1991.