APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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