Zemřela Mary Traversová z tria Peter, Paul and Mary. Deník.cz. 2009-09-17. Dostupné online [cit. 2017-11-27].
nytimes.com
GRIMES, William. Mary Travers, Singer of Protest Anthems, Dies at 72 - Obituary (Obit) - NYTimes.com. New York Times [online]. [cit. 2017-11-27]. Dostupné online.