Website which states the standard temperature for solubility?

Where can i find a website which states the standard temperature for solubility? I know the standard temperature is 25 degrees Celsius but i need to find a website saying that because i need to write a bibliography.Thanks.The only temperature that I know being specified for solubility is 25C when quoting the Ksp value of sparingly soluble substances. If you check the Ksp value of any sparingly soluble substance. or a list of Ksp values, you will invariably find reference to Ksp at 25C. However, I cannot find any website that states as a principle: Ksp values must be determined at 25C. As far as more freely soluble substances are concerned, there are many lists of solubility values, but at a range of temperatures from 0C to 100C. Google Ksp values and look at the links and you will see the references to 25C mentioned. I am not sure if this will be sufficient for you as a reference.