APA aipamena

SINGH Y K. (2017). ENVIRONMENTAL SCIENCE. NEW AGE INTERNATIONAL PUBLISHERS.

Chicago Style aipamena

SINGH Y K. ENVIRONMENTAL SCIENCE. NEW AGE INTERNATIONAL PUBLISHERS, 2017.

MLA aipamena

SINGH Y K. ENVIRONMENTAL SCIENCE. NEW AGE INTERNATIONAL PUBLISHERS, 2017.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.