978-0-415-97374-8,第2頁 Jeff Wagner《MeanDeviation: Four Decades of Progressive Heavy Metal(英语:MeanDeviation (book))》Bazillion Points(英语:Bazillion Points)(2010)ISBN
ISBN 0-7486-1910-0. Jeff Wagner(2010年).《MeanDeviation: Four Decades of Progressive Heavy Metal(英语:MeanDeviation (book))》. Bazillion Points(英语:Bazillion Points)
0-313-35806-0,第101頁 Jeff Wagner《MeanDeviation: Four Decades of Progressive Heavy Metal(英语:MeanDeviation (book))》Bazillion Points(英语:Bazillion Points)(2010)ISBN
(原始内容存档于2017-03-12) (英语). Jeff Wagner《MeanDeviation: Four Decades of Progressive Heavy Metal(英语:MeanDeviation (book))》Bazillion Points(英语:Bazillion Points)(2010)ISBN
Bureau. [2012-01-24]. (原始内容存档于2010-05-16). median computed as the geometric mean of the 20th and 40th percentiles Piketty, Thomas; Saez, Emmanuel, Income