Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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