APA Style is currently in its 6th edition, which was released in 2009. In previous versions of APA format, researchers and scholars were required to include the date that an electronic resource was accessed. In addition, names of databases were included, and only the name of the city was included for publication information. Now, it is no longer required to include the date of access as well as the name of the database in an APA citation. The full location, including the city AND state, or the city and country if it’s an international publisher, is included in the citation.
Most, if not all, of my professors in college were perfectly okay with their students citing Wikipedia. In fact, I had one professor who strongly encouraged it. He was a linguistics professor and, as he stated, Wikipedia has some very thorough descriptions of many languages’ phonologies, including very uncommon languages. Yet as this professor pointed out, he advised us to use Wikipedia just like any other source in that one would not cite only one source in an academic paper. He or she would always look to a multitude of sources, therein providing some checks and balances to his or her own work. If one is doing just that, what is wrong with having Wikipedia be one of those sources?