Cita APA (7a ed.)

Dury, G. H. (1981). An introduction to environmental systems (1. publ.). Heinemann.

Cita Chicago Style (17a ed.)

Dury, Georg H. An Introduction to Environmental Systems. 1. publ. London [u.a.]: Heinemann, 1981.

Cita MLA (9a ed.)

Dury, Georg H. An Introduction to Environmental Systems. 1. publ. Heinemann, 1981.