Søndergaard, T. F.; Andersen, J.; Hjørland, B. (2003). "Documents and the communication of scientific and scholarly information: Revising and updating the UNISIST model". Journal of Documentation. 59 (3): 278. doi:10.1108/00220410310472509. S2CID14697793.
Søndergaard, T. F.; Andersen, J.; Hjørland, B. (2003). "Documents and the communication of scientific and scholarly information: Revising and updating the UNISIST model". Journal of Documentation. 59 (3): 278. doi:10.1108/00220410310472509. S2CID14697793.