APA

Pollock S., . (1993). Ecology. London: Dorling Kindersley.

Chicago

Pollock Steve, . 1993. Ecology. London: Dorling Kindersley.

Harvard

Pollock S., . (1993). Ecology. London: Dorling Kindersley.

MLA

Pollock Steve, . Ecology. London: Dorling Kindersley. 1993.