Jantsch, J. (2010). Referral engine: Teaching your business to market itself. Portofolio.
Citazione stile Chigago Style (17a edizione)Jantsch, John. Referral Engine: Teaching Your Business to Market Itself. London: Portofolio, 2010.
Citatione MLA (9a ed.)Jantsch, John. Referral Engine: Teaching Your Business to Market Itself. Portofolio, 2010.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.