What is the burden of obtaining judicial notice of a motion?

"The burden is on the party requesting judicial notice to supply the court with sufficient, reliable and trustworthy sources of information about the matter. . . . Whether information supplied by a party is sufficient for the purpose will vary from case to case. In some cases the original source documents may be required to provide the court with sufficient information. If the information supplied is not sufficient the trial judge is entitled to refuse to take judicial notice of the matter requested." (People v. Maxwell (1978) 78 Cal.App.3d 124, 130-131.)