Coba jelasin Catatan dari Pencelupan alami dong

The section on William Morris incorporates text from the Dictionary of National Biography, supplemental volume 3 (1901), a publication now in the public domain.

Bryan, Nonabah Gorman & Young, Stella (2002). Navajo Natives Dyes: Their Preparation and Use. Dover Publications. ISBN 978-0-486-42105-6.