The best option would be to use the CINAHL Plus with Full Text database to locate articles relating to nursing theorists.
Tips for using CINAHL:
Do a broad subject search for Nursing Theory or Nursing Models using CINAHL Headings.
To narrow down your search, combine a nursing theory subject heading or theorist name with another subject heading, such as Nursing Models, Theoretical.
Use the Advanced Search option using the drop down menu for AU Author to retrieve articles written by a specific theorist.
Use the Advanced Search option using the drop down menu for NP Named Person to retrieve articles written about a specific theorist.
