John Seymor, H. G. i. b. I. P. Blueprint for a green planet: Your practical guide to restoring the world-s environment. Dorling Kindersley.
Chicago-referens (17:e uppl.)John Seymor, Herbert Girardet illustrated by Ian Penney. Blueprint for a Green Planet: Your Practical Guide to Restoring the World-s Environment. Dorling Kindersley.
MLA-referens (8:e uppl.)John Seymor, Herbert Girardet illustrated by Ian Penney. Blueprint for a Green Planet: Your Practical Guide to Restoring the World-s Environment. Dorling Kindersley.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.