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Frontiers of the unknown:
the insights of psychical research;
with an introduction by C. D. Broad.

APA Citation

MacKenzie, A. (1968). Frontiers of the unknown: the insights of psychical research. London: Barker.

MLA Citation

MacKenzie, Andrew. Frontiers of the Unknown: the Insights of Psychical Research. London: Barker, 1968.

Warning: These citations may not always be complete (especially for serials).