APA استشهاد

Covington, G. (2010). Water management. Apple Accademics.

استشهاد بنمط شيكاغو

Covington, Gareth. Water Management. Oakville: Apple Accademics, 2010.

MLA استشهاد

Covington, Gareth. Water Management. Apple Accademics, 2010.