APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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