APA-viite

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

Chicago-tyylinen lähdeviittaus

Williams,C N, Peregrine W T H, ja Uzo,J O. Vegetable Production in the Tropics. England: Longman group UK limited, 1991.

MLA-viite

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