Herbst, Philip The Color of Words: An Encyclopaedic Dictionary of Ethnic Bias in the United States Intercultural Press Inc (31 December 1997) ISBN 978-1-877864-97-1 p. 116 [1]
Wilton, David; Brunetti, Ivan Word myths: debunking linguistic urban legends Oxford University Press USA (13 January 2005) ISBN 978-0-19-517284-3 pp. 164–165 [2]