(en) Nobelprize in Economic Sciences 2023. The Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel 2023. Geraadpleegd op 29 december 2023.
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(en) Alex Cobham; Andy Sumner, Is It All About the Tails? The Palma Measure of Income Inequality. Center for Global Development (23 oktober 2013). Gearchiveerd op 1 februari 2021. Geraadpleegd op 1 februari 2021. “The “Palma” is the ratio of national income shares of the top 10 percent of households to the bottom 40 percent, reflecting Gabriel Palma’s observation of the stability of the “middle” 50 percent share of income across countries so that distribution is largely a question of the tails”
(en) Alex Cobham; Andy Sumner, Is It All About the Tails? The Palma Measure of Income Inequality. Center for Global Development (23 oktober 2013). Gearchiveerd op 1 februari 2021. Geraadpleegd op 1 februari 2021. “The “Palma” is the ratio of national income shares of the top 10 percent of households to the bottom 40 percent, reflecting Gabriel Palma’s observation of the stability of the “middle” 50 percent share of income across countries so that distribution is largely a question of the tails”