Gaya APA

CUNNINGHAM, W, P., Cunningham, M, A. (2006). Principles of environmental science: inquiry and applications (THIRD EDITION). Amerika: McGraw-HillBook .

Gaya MLA

CUNNINGHAM, William, P., Cunningham, Mary, Ann. "Principles of environmental science: inquiry and applications". THIRD EDITION Amerika: McGraw-HillBook , 2006. FAKULTAS ILMU KESEHATAN.