Citazione APA

Stephen R Covey & Sadasivan M P. (2014). Seven habbits of highly effective people. D C Books.

Stile di citazione Chicago

Stephen R Covey e Sadasivan M P. Seven Habbits of Highly Effective People. Kottayam: D C Books, 2014.

Citazione MLA

Stephen R Covey e Sadasivan M P. Seven Habbits of Highly Effective People. D C Books, 2014.