Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleTribute to the theorists. Callista Roy over the years.AuthorsFrederickson K; Velasco-Whetsell MPublicationNursing Science Quarterly, 2007, Vol 20, Issue 2, p107ISSN0894-3184Publication typeJournal ArticleDOI10.1177/0894318407299841