If unpublished:
(first mention)
David Lowenthal, ‘Dilemmas and Delights of Learning History’, unpublished paper delivered at the conference ‘Knowing, Teaching and Learning History: National and International Perspectives’ (University of Pittsburgh, 18-19 November 1998), p. 65.
(subsequent mentions)
Lowenthal, pp. 78-80.
If published in a monograph:
Treat as a Chapter in an Edited Book
If published in a journal:
Treat as a Journal Article
Lowenthal, David, ‘Dilemmas and Delights of Learning History’, unpublished paper delivered at the conference ‘Knowing, Teaching and Learning History: National and International Perspectives’ (University of Pittsburgh, 18-19 November 1998)
If published in a monograph:
Treat as a Chapter in an Edited Book
If published in a journal:
Treat as a Journal Article