Pearson, Karl (1896). "Mathematical Contributions to the Theory of Evolution – On a Form of Spurious Correlation Which May Arise When Indices Are Used in the Measurement of Organs". Proceedings of the Royal Society of London. 60 (359–367): 489–498. doi:10.1098/rspl.1896.0076. JSTOR115879.
Galton, Francis (1896). "Note to the memoir by Professor Karl Pearson, F.R.S., on spurious correlation". Proceedings of the Royal Society of London. 60 (359–367): 498–502. doi:10.1098/rspl.1896.0077. S2CID170846631.
Lovell, David; Müller, Warren; Taylor, Jen; Zwart, Alec; Helliwell, Chris (2011). "Chapter 14: Proportions, Percentages, PPM: Do the Molecular Biosciences Treat Compositional Data Right?". In Pawlowsky-Glahn, Vera; Buccianti, Antonella (eds.). Compositional Data Analysis: Theory and Applications. Wiley. doi:10.1002/9781119976462. ISBN9780470711354.
Pearson, Karl (1896). "Mathematical Contributions to the Theory of Evolution – On a Form of Spurious Correlation Which May Arise When Indices Are Used in the Measurement of Organs". Proceedings of the Royal Society of London. 60 (359–367): 489–498. doi:10.1098/rspl.1896.0076. JSTOR115879.
Galton, Francis (1896). "Note to the memoir by Professor Karl Pearson, F.R.S., on spurious correlation". Proceedings of the Royal Society of London. 60 (359–367): 498–502. doi:10.1098/rspl.1896.0077. S2CID170846631.