Cita APA (7th ed.)

Volk, T. Biosphere: Tyler Volk. Keywords for environmental studies.([2016]).

Cita Chicago (17th ed.)

Volk, Tyler. "Biosphere: Tyler Volk." Keywords for Environmental Studies.([2016]) .

Cita MLA (8th ed.)

Volk, Tyler. "Biosphere: Tyler Volk." Keywords for Environmental Studies.([2016]), .

Atenció: Aquestes cites poden no estar 100% correctes.