3. Non-transitory computer storage that stores a mobile application that provides functionality for generating citations using photographic images of reference materials, the mobile applications comprising executable instructions that direct a mobile computing device to perform a process that comprises: determining a code from a photograph of a bar code of a printed publication, said code identifying the printed publication, wherein the code is an ISBN code obtained the bar code; generating a textual representation of a user-selected content portion of the printed publication, wherein generating the textual representation comprises applying Optical Character Recognition to a photographic image of the user-selected content portion; retrieving information regarding the printed publication using said code; generating a bibliographic citation for the content portion using the retrieved information regarding the printed publication; and storing the content portion in association with the bibliographic citation.
3. Non-transitory computer storage that stores a mobile application that provides functionality for generating citations using photographic images of reference materials, the mobile applications comprising executable instructions that direct a mobile computing device to perform a process that comprises: determining a code from a photograph of a bar code of a printed publication, said code identifying the printed publication, wherein the code is an ISBN code obtained the bar code; generating a textual representation of a user-selected content portion of the printed publication, wherein generating the textual representation comprises applying Optical Character Recognition to a photographic image of the user-selected content portion; retrieving information regarding the printed publication using said code; generating a bibliographic citation for the content portion using the retrieved information regarding the printed publication; and storing the content portion in association with the bibliographic citation. 6. The non-transitory computer storage of claim 3 , wherein the mobile application includes a user interface for user entry of comments to be stored in association with the content portion.