Copsey, I. (2011). Harmonic Elliott wave: The case for modification of R.N. Elliott's impulsive wave structure. Wiley.
Tohutoru Kātū Chicago (17th ed.)Copsey, Ian. Harmonic Elliott Wave: The Case for Modification of R.N. Elliott's Impulsive Wave Structure. Singapore: Wiley, 2011.
Tohutoro MLA (9th ed.)Copsey, Ian. Harmonic Elliott Wave: The Case for Modification of R.N. Elliott's Impulsive Wave Structure. Wiley, 2011.
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