References in classic literature ?
Armed with this ominous letter of introduction, I kicked a chair down against the folding-doors, by way of giving a preliminary knock to arouse the housekeeper's attention.
In the first attack, an elderly woman answered a knock to her door in Lawnview Street, North Belfast, at 7.
Half an hour later, an elderly man answered a knock to the door of his house in Graymount Drive, Newtownabbey.
Now over a million people visit Knock to pray at the shrine.
Don't bother getting yourself a decent accountant, just head to Knock to sort out your j to r Revenue woes.