Cita APA (7th ed.)

Watts, S., & Halliwell, L. (1996). Essential environmental science: Methods & techniques. Routledge.

Cita Chicago (17th ed.)

Watts, Simon, i Lyndsay Halliwell. Essential Environmental Science: Methods & Techniques. New York: Routledge, 1996.

Cita MLA (9th ed.)

Watts, Simon, i Lyndsay Halliwell. Essential Environmental Science: Methods & Techniques. Routledge, 1996.