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Robertson, Robin (30 May 2007). "Seven Paths of the Hero in Lord of the Rings: Introduction". Psychological Perspectives. 50 (1): 79–94. doi:10.1080/00332920701319491. S2CID143849565.
Robertson, Robin (27 May 2009). "Seven Paths of the Hero in Lord of the Rings: The Path of Love". Psychological Perspectives. 52 (2): 225–242. doi:10.1080/00332920902880846. S2CID144447881.
Skogemann, Pia (2009). Where the Shadows Lie: a Jungian Interpretation of Tolkien's The Lord of the Rings. Chiron Publications. p. 14. ISBN978-1-888602-45-6. OCLC318641399.