APA aipamena

Higgins, W., & Gann, G. (2015). The conservation dilemma.

Chicago Style aipamena

Higgins, Wesley, y George Gann. The Conservation Dilemma. 2015.

MLA aipamena

Higgins, Wesley, y George Gann. The Conservation Dilemma. 2015.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.