Cita APA (7th ed.)

(2016). Grassland ecosystems / by Melissa Higgins ; content consultant, Sara G. Baer.

Cita Chicago (17th ed.)

Grassland Ecosystems / by Melissa Higgins ; Content Consultant, Sara G. Baer. 2016.

Cita MLA (9th ed.)

Grassland Ecosystems / by Melissa Higgins ; Content Consultant, Sara G. Baer. 2016.

Atenció: Aquestes cites poden no estar 100% correctes.