The phrase "a source of humour" is correct and usable in written English.
It can be used to describe something that provides amusement or laughter, often in a specific context such as a story, joke, or situation.
Example: "The comedian's unique perspective on everyday life is truly a source of humour for his audience."
Alternatives: "a source of laughter" or "a wellspring of comedy".
Harems, of course, have always been a source of humour in the West.
The cohesiveness of AA's culture has been a source of humour to outsiders, who have labelled its bean counters "Androids".
It is this statement that you are separate, that you are something to ridicule, that you're a source of humour," said Joe Householder.
Manti Te'o has been the butt of many jokes since his dead online girlfriend was revealed to be a hoax; now he has become a source of humour to another sports star who has often suffered online baiting – LeBron James.
It has been established that the images are indeed a source of humour to security workers, which makes it harder to disagree with groups who say the machines abuse passengers' rights to privacy and dignity.So far the operators have only been caught laughing at their colleagues.
There's no sign of the sexual-baiting which seemed to be a source of humour in the 1969 film (trailer below for comparison), and with newcomer Hailee Steinfeld set to take Darby's role, any reprise might take on a rather darker tone: Steinfeld is just 13, while Darby was a 21-year-old woman playing a teenager.
Teddy's role in getting the Cahill visa was always a source of much humour for the senator.
She is famous for her lavish trips (hence the parliamentary review of her budget) and her gaudy wardrobe is a source of some humour.
In the news pages, we report on new turmoil in Syria and Iraq, child refugees in Calais and Donald Trump's US foreign policy plans, a source of black humour if ever there was one.
This is a source of both humour and poignancy.
The player's agency to mess with a scene can, however, be a tremendous source of humour.
