‏‫‬‭consultants and consulting organizations directory: a reference guide to move than 25,000 concerns and individuals engaged in consultation for business, industry, and government: Supplement[Book]‏‫\. Deborah J. Baker Project editor‬
(کانسالتنتس اند کانسالینگ ارگانیزیشنز دایرکتری ساپلمنت)