Attenborough, D. (1990). The trials of life: A natural history of animal behavior. Little, Brown.
Chicago-viite (17. p.)Attenborough, David. The Trials of Life: A Natural History of Animal Behavior. Boston: Little, Brown, 1990.
MLA-viite (9. p.)Attenborough, David. The Trials of Life: A Natural History of Animal Behavior. Little, Brown, 1990.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.