Citazione Stile APA (7a Edizione)

Simon, N. (1993). The Guinness guide to nature in danger: Threatened habitats and species. Guinness Publishing Ltd.

Citazione stile Chigago Style (17a edizione)

Simon, Noel. The Guinness Guide to Nature in Danger: Threatened Habitats and Species. Enfield, Middlesex, England: Guinness Publishing Ltd, 1993.

Citatione MLA (9a ed.)

Simon, Noel. The Guinness Guide to Nature in Danger: Threatened Habitats and Species. Guinness Publishing Ltd, 1993.