Gaya APA

Curningham, W, P., Cunningham, M, A. (2013). Principles of Environment Science : Inquiry and Application (Seventh Edition). New York. USA: Mc Graw Hill Education.

Gaya MLA

Curningham, William, P.., Cunningham, Mary, Ann. "Principles of Environment Science : Inquiry and Application". Seventh Edition New York. USA: Mc Graw Hill Education, 2013. Text.