1. A system for linking source material to external reference material s for display , the system comprising: a source material image including a plurality of discrete pieces having links to external reference materials comprising any of textual, audio, video, and picture information, said source material image stored in an electronic database; means for determining an a beginning position address on said of a source material stored in an electronic database for the beginning position of said source material image ; means for cutting said the source material image into said a plurality of discrete pieces; means for determining a starting point address and an ending point address on said electronic database for a start point and an end point of said of at least one of the plurality of discrete pieces of said image based upon said the beginning position of said source material image address ; means for recording said in a look-up table the start ing and said end ing point addresses in a look-up table ; means for linking at least one of the plurality of discrete pieces to at least one of a plurality of external reference materials by recording in the look-up table, along with the starting and ending point addresses of the at least one of the plurality of discrete pieces, a link to the at least one of the plurality of external reference materials, the plurality of external reference materials comprising any of textual, audio, video, and picture information; means for displaying an image of the source material; means for selecting a discrete portion of said the displayed source material image; means for determining the a display address on said electronic database of said the selected discrete portion; means for converting said the display address of said the selected discrete portion to an offset value from said the beginning position address of said source material image ; means for comparing said the offset value with said recorded the start ing and end ing point addresses of said discrete pieces recorded in said the look-up table to identify one of the plurality of discrete pieces ; means for selecting an external reference that corresponds to said look-up table start and end point address one of the plurality of external reference materials corresponding to the identified one of the plurality of discrete pieces ; and means for retrieving the selected one of the plurality of external reference materials using a recorded link to the selected one of the plurality of external reference materials; and means for reproducing said displaying the retrieved external reference material .