John Seymor, H. G. i. b. I. P. Blueprint for a green planet: Your practical guide to restoring the world-s environment. Dorling Kindersley.
Lua i Stíl Chicago (17ú heag.)John Seymor, Herbert Girardet illustrated by Ian Penney. Blueprint for a Green Planet: Your Practical Guide to Restoring the World-s Environment. Dorling Kindersley.
Lua MLA (8ú heag.)John Seymor, Herbert Girardet illustrated by Ian Penney. Blueprint for a Green Planet: Your Practical Guide to Restoring the World-s Environment. Dorling Kindersley.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.