Gould
Music Lover's Encyclopedia · 1939 · p. 7
Nathaniel Duren, Chelmsford, Ma ., 1781—Boston, 1864; duct or and writer.
Bu kavram başka kaynaklarda da geçiyor
Everybody's Encyelopedia (1912)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
A Dictionary of American Authors (1904)
Smith's Financial Dictionary (1903)
Pears Shilling Cyclopedia (1898)
Modern English Biography (1892)
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