Randall J. Bayer, Christopher F. Puttock and Scot A. Kelchner. 2000. Phylogeny of South African Gnaphalieae (Asteraceae) based on two noncoding chloroplast sequencesAmerican Journal of Botany. 2000; 87:259-272Archivado el 27 de enero de 2011 en Wayback Machine., p.271. Downloaded on 14 July 2009.
Randall J. Bayer, Christopher F. Puttock and Scot A. Kelchner. 2000. Phylogeny of South African Gnaphalieae (Asteraceae) based on two noncoding chloroplast sequencesAmerican Journal of Botany. 2000; 87:259-272Archivado el 27 de enero de 2011 en Wayback Machine., p.271. Downloaded on 14 July 2009.