What exactly are you asking? You want to know the sources that indicate how many seasons have aired? 28 seasons have aired, with the show being renewed through its 30th... as for sources that state that, there are several to choose from. Wikipedia. FOX. SimpsonsWiki.
As of June 2015, 25 seasons have aired.
As of November 2014, that would be 22.
"Every Man's Dream" was the 575th episode aired on The Simpsons
There are four seasons all together.there are 6 seasons all together so far but from sources it says they are doing at least 10 seasons
Simpsorama
Covercraft
Luca$
YOLO
The first Halloween special for "The Simpsons" aired in 1990. The shows are referred to "Treehouse of Horror". The very first was called "The Simpsons Halloween Special".
No. BBC1 aired The Simpsons first in the U.K.
234 episodes aired during that decade.
While technically no one can know how many episode were literally made in 2009, 20 new episodes aired in the calendar year.