Karlson David. (2004). Marketing Your Consulting or Professional Services. Viva Books.
Citazione stile Chigago Style (17a edizione)Karlson David. Marketing Your Consulting or Professional Services. New Delhi: Viva Books, 2004.
Citatione MLA (9a ed.)Karlson David. Marketing Your Consulting or Professional Services. Viva Books, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.