Identification for ringers. 2, The genus Phylloscopus /
by Kenneth Williamson.
- [Oxford] : British Trust for Ornithology, 1962.
- 88 p., plates : ill. ; 22 cm.
- British Trust for Ornithology identification guide ; no. 2 Field guide ; no. 8. .
- British Trust for Ornithology identification guide ; no. 2 Field guide (British Trust for Ornithology) ; no. 8. .