How do you cite (in APA) the authors last name when it is a foreign language with special unknown characters that can't be identified by most word processors.
Try shapecatcher.com and detexify.kirelabs.org to identify the characters. Then proceed from there by inserting a Unicode char in a Unicode font or a latex command (depending on whether you are using MSWord or some form of LaTeX). Once you have identified the character, also try an online search engine to find out spellings easier for you, e.g., the romanized ones.
If everything else fails, ask the sources where you got the name from. The contact person can be an editor, a publisher, a coauthor, or the author himself/herself. Some authors maintain homepages with a correct spelling of their name; if it is the case for the author in question, take a look at their HTML code.
Google the webpage of the author. If this is unicode, then cut and paste the special character into Google. Otherwise, find his name rendered in unicode somewhere on the internet, and Google the character. This should take you to a webpage that tells you what the character is. You can then Google to find out how to type it in your word processor. Or (depending on the word processor) you can just cut and paste the unicode.