Gaya APA

Cunningham, M, A., Cunningham, W. (2017). Principles of Environment Science : Inquiry and Application (Eight Editon). New York. USA: Mc Graw Hill Education.

Gaya MLA

Cunningham, Mary, Ann., Cunningham, William. "Principles of Environment Science : Inquiry and Application". Eight Editon New York. USA: Mc Graw Hill Education, 2017. Text.