APA

Kirby R. H., . (2013). World Crops Books. London: Leonard Hill Books.

Chicago

Kirby R H, . 2013. World Crops Books. London: Leonard Hill Books.

Harvard

Kirby R. H., . (2013). World Crops Books. London: Leonard Hill Books.

MLA

Kirby R H, . World Crops Books. London: Leonard Hill Books. 2013.