Verbatim text: Challice, J. S. and M. N. Westwood. 1973. Numerical taxonomic studies of the genus Pyrus using both chemical and botanical characters. Bot. J. Linn. Soc. 67: 121–148.
Author: Challice, J.S., Westwood, M.N.
Year: 1973
Title: Numerical taxonomic studies of the genus Pyrus using both chemical and botanical characters
Journal: Bot. J. Linn. Soc
Volume: 67
Pages: 121–148