* The corporation's bylaws. The corporation's bylaws will typically specify the design of the corporate seal and how it is to be used.
* The corporation's minute book. The corporation's minute book will contain a record of all resolutions passed by the board of directors, including resolutions approving the design of the corporate seal and authorizing its use.
In addition to these sources, information about corporate seals can also be found in a number of legal encyclopedias and treatises.