^ a b c Williamson, Samuel H., "Five Ways to Compute the Relative Value of a UK Pound Amount, 1830 to Present", MeasuringWorth.
↑ Усе пераклады разлічваюцца па сістэме RPI basis per Measuringworth «Five Ways to Compute the Relative Value of a UK Pound Amount, 1830 to Present», MeasuringWorth.com.