Gaya APA

Karlson, D., Davidson, J. (1988). Marketing your consulting and professional service : a step by-step program of proven marketing techniques . Menlo Park: Crisp Publications.

Gaya MLA

Karlson, David., Davidson, J.P.. "Marketing your consulting and professional service : a step by-step program of proven marketing techniques". Menlo Park: Crisp Publications, 1988. Buku/Printed Material.