Watts, S., & Halliwell, L. (1996). Essential environmental science: Methods and techniques. Routledge.
Citazione stile Chigago Style (17a edizione)Watts, Simon, e Lyndsay Halliwell. Essential Environmental Science: Methods and Techniques. New York: Routledge, 1996.
Citatione MLA (9a ed.)Watts, Simon, e Lyndsay Halliwell. Essential Environmental Science: Methods and Techniques. Routledge, 1996.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.