APA Style

Walters, M. et al (2014). The complete encyclopedia of trees of the world : the ultimate reference and identification guide to more than 1300 of the most spectacular, best-loved and unusual trees around the globe, with 3000 specially commissioned illustrations, maps and photographs . London: Lorenz Books.

MLA Style

Walters, Martin. et al. "The complete encyclopedia of trees of the world : the ultimate reference and identification guide to more than 1300 of the most spectacular, best-loved and unusual trees around the globe, with 3000 specially commissioned illustrations, maps and photographs". London: Lorenz Books, 2014. Printed Book.