Corruption and bribery are quite common in Turkey’s public and private sectors. However, people may draw the line differently, viewing minor payments as rewards for getting a job done rather than as bribes. Also, keep in mind that there is a fine line between giving gifts and bribing. What you may consider a bribe, a Turk may view as only a nice gift , and so much as hinting that you view it differently could be a grave insult to the person’s honor. It may help if you introduce and explain your company’s policies early on, but be careful not to moralize or appear to imply that local customs are unethical.
The passage above is from the book (p. 428) Negotiating International Business: The Negotiator’s Reference Guide to 50 Countries Around the World by Lohar Katz. The book is published in 2006. So this is the image of Turkey in some business circles I guess.